Expect to spend a heck of a lot of time on the sofa, esp if you're bfing. I find babies are generally quite easy the first couple of weeks, they sleep a lot, and feed, and that's it really. A couple of weeks in they start to be a bit more alert, and for some that's when the crying starts. Don't want to alarm you but early evening is a typical time for almost inexplicable crying in a newborn. You can't for the life of you work out what's causing it, it usually peaks at around 8 weeks and then you'll start to find your feet again.
I think the first 8 weeks are the hardest. don't attempt to keep a clean tidy house in that time, don't attempt to entertain unless your dh is a chef or a waiter or very domesticated :o Tell people they can only visit if they bring their own tea and cakes :o
The washing is phenomenal, new borns really puke a lot. It's alarming, and you'll definitely be convinced there's something wrong, but in all likelihood there isn't. If the baby is producing wet nappies and gaining weight then all is fine. But the puking.. oh the puking. DD could get a good three foot spurt sometimes
Expect to become alarmingly obssessed with poo, the frequency, the colour, the timing. Sometimes they don't poo for a few days (esp if bf, breastmilk is very efficient, not much waste is produced) and you can get obssessed about it, then your little tiny baby will produce a poo of such size you'll be amazed they had room for it :o
Most of expect to be incredulous at how much this tiny helpless person can take over your life, but also how much you really don't care that you haven't washed your hair in days and are still wearing the same baggy trackies you were wearing a week ago, because you love them so much :o