Not to bother with a birth plan - you have no idea how amazing your body is, and what it is capable of (pushed for 3 hrs and about 4 before that of serious contractions, but a not a single aspirin.) I was amazed.
Don't scream - my midwife told me to use the energy to push and it gave me something to focus on rather than the contractions hurting.
That dh might as well not have been there, as I was so focussed on what I was doing that he must have felt like a spare part (until the emergency c-sec, when it was lovely to have him there).
Being in a warm bath REALLY helps with contractions.
That they sleep for ages when they've been born. I remember being stuck in bed with baby on the other side of the room and not sleeping for fear he would wake and need me and I wouldn't be able to get him and the midwives wouldn't hear him crying. He slept for hours and hours and I should have made the most of it.
C-sections really are not that bad (although I have no point of comparison as I've not had a natural birth). Having a c-sec doesn't make you a bad mother. It's everything after that that makes a you a good one. Getting baby out in one piece and keeping you healthy too it's what it's all about.
Sorry, I know that's more than 3 .