Some excerpts that I have found helpful:-
Essentially, narcissists are unable or unwilling to trust either the world or other people to meet their needs. Perhaps they were born to parents unable to connect emotionally and, thus, as infants learned not to let another person be essential to them in any way. Perhaps NPD starts later, when intrusive or abusive parents make it dangerous for the child to accept other people's opinions and valuations. Maybe it comes from a childhood environment of being treated like royalty or little gods. Whatever the case, narcissists have made the terrible choice not to love. In their imaginations, they are complete unto themselves, perfect and not in need of anything anyone else can give them. (NB: Narcissists do not count their real lives i.e., what they do every day and the people they do it with as worth anything.) Their lives are impoverished and sterile; the price they pay for their golden fantasies is high: they'll never share a dream for two.
Now, it is possible to have a relatively smooth relationship with a narcissist, and it's possible to maintain it for a long time. The first requirement for this, though, is distance: this simply cannot be done with a narcissist you live with. Given distance, or only transient and intermittent contact, you can get along with narcissists by treating them as infants: you give them whatever they want or need whenever they ask and do not expect any reciprocation at all, do not expect them to show the slightest interest in you or your life (or even in why you're bothering with them at all), do not expect them to be able to do anything that you need or want, do not expect them to apologize or make amends or show any consideration for your feelings, do not expect them to take ordinary responsibility in any way. But note: they are not infants; infants develop and mature and require this kind of care for only a brief period, after which they are on the road to autonomy and looking after themselves, whereas narcissists never outgrow their demands for dedicated attention to their infantile needs 168 hours a week. Adult narcissists can be as demanding of your time and energy as little babies but without the gratification of their growing or learning anything from what they suck from you. Babies love you back, but adult narcissists are like vampires: they will take all you can give while giving nothing back, then curse you for running dry and discard you as a waste of their precious time.
It is also essential that you keep emotional distance from narcissists. They're pretty good at maintaining a conventional persona in superficial associations with people who mean absolutely nothing to them, and they'll flatter the hell out of you if you have something they can use or if, for some reason, they perceive you as an authority figure. That is, as long as they think you don't count or they're afraid of you, they'll treat you well enough that you may mistake it for love. But, as soon as you try to get close to them, they'll say that you are too demanding and, if you ever say "I love you," they'll presume that you belong to them as a possession or an appendage, and treat you very very badly right away. The abrupt change from decent treatment to outright abuse is very shocking and bewildering, and it's so contrary to normal experience that I was plenty old before I realized that it was actually my expression of affection that triggered the narcissists' nasty reactions. Once they know you are emotionally attached to them, they expect to be able to use you like an appliance and shove you around like a piece of furniture. If you object, then they'll say that obviously you don't really love them or else you'd let them do whatever they want with you. If you should be so uppity as to express a mind and heart of your own, then they will cut you off just like that, sometimes trashing you and all your friends on the way out the door. The narcissist will treat you just like a broken toy or tool or an unruly body part: "If thy hand or thy foot offend thee, cut them off" [Matt. 18:8]. This means you.
So, yes, it's possible to get along with narcissists, but it's probably not worth bothering with. If family members are narcissists, you have my deep sympathy. If people you work with are narcissists, you will be wise to keep an eye on them, if just for your own protection, because they don't think very well, no matter what their IQs, they feel that the rules (of anything) don't apply to them, and they will always cut corners and cheat wherever they think they can get away with it, not to mention alienating co-workers, clients, and customers by their arrogance, lies, malice, and off-the-wall griping. Narcissists are threatened and enraged by trivial disagreements, mistakes, and misunderstandings, plus they have evil mouths and will say ANYTHING, so if you continue to live or work with narcissists, expect to have to clean up after them, expect to lose friends over them, expect big trouble sooner or later.
If you're reading this because of problems with someone you know now, the chances are excellent that one or both of your parents was a narcissist. Narcissists are so much trouble that only people with special prior training (i.e., who were raised by narcissists) get seriously involved with them. Sometimes narcissists' children become narcissists, too, but this is by no means inevitable, provided stable love was given by someone, such as the non-narcissist parent or grandparents. Beyond that, a happy marriage will heal many old wounds for the narcissist's child. But, even though children of narcissists don't automatically become narcissists themselves and can survive with enough intact psychically to lead happy and productive lives away from their narcissistic parents, because we all love our parents whether they can love us back or not, children of narcissists are kind of bent "You can't get blood out of a stone," but children of narcissists keep trying, as if by bonding with new narcissists we could somehow cure our narcissistic parents by finding the key to their heart. Thus, we've been trained to keep loving people who can't love us back, and we will often tolerate or actively work to maintain connections with narcissistic individuals whom others, lacking our special training, find alienating and repellent from first contact, setting ourselves up to be hurt yet again in the same old way. Once narcissists know that you care for them, they'll suck you dry demand all your time, be more work than a newborn babe -- and they'll test your love by outrageous demands and power moves. In their world, love is a weakness and saying "I love you" is asking to be hurt, so be careful: they'll hurt you out of a sort of sacred duty. They can't or won't trust, so they will test your total devotion. If you won't submit to their tyranny, then you will be discarded as "no good," "a waste of time," "you don't really love me or you'd do whatever I ask," "I give up on you." (Note: In many instances, narcissists' demands are not only outrageous but also impossible to fulfill even if you want to please them. Plus if you actually want to do what they want you to do, that would be too much like sharing, so they won't want it anymore.)
If you've had a narcissist for a parent, you are probably not afraid of dying and going to hell -- you have lived hell on Earth. Narcissists cannot be satisfied and do a tremendous amount of damage to their children and partners in their relentless demand for a perfect outer appearance to reflect the perfect inner image that obsesses them.