I did a lot of reading of threads just like this one, so there wasn't much that surprised me!
Two things I can think of though:
-That it takes days before your milk comes in. How did I miss that?
-That it can take a long time for abdominal muscles to get anywhere near each other again. I was SO upset to wake up in the middle of the night to feed DD, only to find that I couldn't sit up by myself. A compression belt was a life-saver for the first few weeks.