I recommend Ina May’s Guide to Childbirth!
I read both of the books above and liked them but would add a 3rd book and this is the order I recommend them as far as which one helped me learn and prepare the most 1. Hypnobirthing by Siobhan Miller 2. Ina May's Guide 3. Hypnobirthing the Mongan Method I prefer the first hypnobirthing one to the original because I felt like the original really just tried to push taking their class a lot. But if you're about to take their class then it probably wouldn't be a big deal. I've also downloaded a couple of hypnobirthing apps and practice meditation daily. Start now so when it comes time you know how to utilize it well for your birth =] you'll be great!!
I read hypnobirthing the mongan method and felt it helped a lot!