The thing that really helped prep me (as much as possible) was reading positive birth stories - Ina May Gaskin's "Guide to Childbirth" is FABULOUS. Or, like Violet said, watching live birth videos if you're not a reader. Honestly, knowing it was going to be really hard to relax, but also that relaxing would help me give birth easier was helpful. It's what I concentrated on through every contraction. Have one or two support people (not doctors, nurses, or midwives) like your SO, mom, friend... the support makes ALL the difference!! If you don't have someone to rely on in your life, hire a doula.