To some degree, you can't quite know how it will be, because it will all be a learning experience for you, with first baby, and you also don't know what sort of little person your baby will be.
In my experience, the first challenge is routine. My babies have always been happiest with a very gentle, responsive routine which underpins everything, and does take precedence over anything else. In time of course this changes, but at six months I think it's still very important. Otherwise they get upset - a different environment, not the same bed/bed clothes, not the same smells, not the same temperature - even just the journey to start with - all of this can upset them. And if they're upset, it will be bad for you.
And if the baby got ill, that would be terrible. Would the baby need vaccinations for going? You should perhaps check (and check at what stage of his/her own vaccination schedule he/she will be on).
To be honest, I would feel slightly worried about such a trip - so far, and such a different and, to some extent, unknown environment. Having said that, I also wouldn't want to go on my own and leave my baby at home (literally couldn't have done that - especially when breastfeeding).
I'd wait until the baby is born and see how things go, and how you are. Then I'd make a decision, later. I wouldn't be forced into anything. It's not the end of the Earth if you don't go. And I wouldn't take the potential challenges of the trip lightly. (I feel exhausted just hearing about it!)
All mothers have their own way. You will know better when you know yourself and your husband as parents, and when you know your baby.
For example, my youngest simply couldn't - could not - be in a baby car seat for more than about two minutes without wailing and thrashing. She hated it. She was a super baby and almost never got upset, so I listened to her on this one and avoided subjecting her to it. She couldn't tell me in words but she sure did her best to show me how she was feeling! : )
There's time for everything, but some things can't be rushed. I probably wouldn't risk it.