That there are (roughly) two types of birth:
a) the "OMG, that was painful, thank goodness I had a tens machine/kept breathing/had a water birth (etc)... But it was worth it, I got a real buzz out of seeing my baby, and now a couple of months on I can't really remember the pain." birth
b)the "how can something so totally horrific happen to a person and the person not die? Breathing/massage/water/movement - all completely impossible. Birth plan out the window. By the end I just wanted to crawl under a rock and die. I didn't really want to gaze on my baby afterwards, I was too busy throwing up. And now, 6 months on, I can remember every sodding contraction" birth.
Mine was most definitely fell into the B category. If you have a horrific experience, you go into mourning for your birth plan for a while, but at the end of the day, it doesn't stop you enjoying your baby and being a good mum.
Also - BREAST FEEDING IS REALLY HARD! everyone feels like a failure at some point, persistence/sheer blody-mindedness is the key.
What else... Oh - urinary incontinence for the first 24 hours. lovely. You've never seen a girl working so hard on pelvic floor exercises!