You can't generalise about childbirth and you can't generalise about migrating. Everyone's experience is different, some good, some bad, most somewhere in the middle, but things can go seriously wrong in childbirth, the important thing is to be prepared.
You can do your research but ultimately you don't know how the experience is going to go, or how you will feel - if you did then it wouldn't be so exciting. Be positive for sure, but don't rule out the possibility that not everything will go to plan. Be prepared for some disappointment, just in case things turn out worse than you expected. Hope for the best but prepare for the worst.