The things i didnt know:
You bleed for 6 weeks after. I had haemorrhaging after all mine. That was terrifying. So I also learned that if you have to go to hospital you can bring your baby with you.
The baby's first poo's stick to their delicate skin like glue. Cotton wool and water is not much help so slather the baby's bum in Vaseline and it will all glide off.
Milk coming in is agonising (worse than labour in my case as I had epidurals for labour) I didn't find anything to relieve it.
Breastfeeding is very convenient....for those for whom it works. If you decide against or it's difficult for you do not be bullied by anyone to continue. Your body your choice. (this stems from two new mothers on my ward, one was horribly bullied by a BF "advisor" and the other was really confident she didnt want to so shut down every attempt to convince her. You need her confidence. Otoh my first born took to it like a dream so I didnt have any issues but I was embarrassed when other mothers tried to involve me in that Breast is superior type of conversation. My second child had no interest at all and I would have given up had he been my first. I would hate to have been made to feel bad over that.
Bathing a baby in a high baby bath is much easier on you and probably gives you better grip/baby more faith in you while bathing (i had one for my 2nd, not my 1st. My 1st hated bath time the second loved it, I put this down to my comfort in bathing them)
Bear in mind your baby has no one to compare your parenting to: you are both learning the ropes together. Be kind to yourself, I never came across oneupmanship like I did over childbirth and parenting as I did when the children were Small. The judgement and subsequent knocking of other new mothers was often nasty. There is very little of it now they are teenagers!