Don't be afraid to put your foot down regarding your boundaries and your dc. They are your child, not extended families and you get to raise them and care for them how you see fit. Other people's feelings don't matter as much as those two things.
Breastfeeding hurts like a bastard (or other can) and it is not your fault if you don't manage it. Being induced /csection can make it ten times harder to get going because it takes longer for milk to come in.
Milk coming in also hurts like a motherfucker. And you can't even take any bloody painkillers for it.
COMPARISON IS THE THEIF OF JOY.
This applies to the lot of it, conceiving, labour, milestones, pregnancy, the whole shebang. Don't compare, just crack on with it in the manner that you feel is best.
Look after your back. Back pain is not in the least bit funny.
If you loath the newborn stage, even if the baby is very much planned etc, you are not a failure. If you love it that's great.
Don't be afraid of calpol. If they are sick /teething and it seems to make them fall asleep, it's not. They are just already knackered and no longer in so much pain that they can't sleep.
With that being said, it's a total myth that newborns just sleep. Some do. Mine didn't. (still doesn't and he's 5 now)
Get yourself one of those insulated mugs if you like hot drinks. Total game changer.
If you find going out every day too tough, don't go out every day. If you find it helps you, do it.
It's not as hard as it sounds because the good bits make the hard bits not so tough.