I'm a mama now, but I used to be in your shoes. I started coming to MDC about six months before we had a baby through adoption, and at the time, of course, had no idea when I'd be a mom. It was wonderful that the women here accepted me so readily.
I can relate to your feelings--I felt so strongly about AP, but didn't have the actual parenting experience to back it up. I read everything I could get my hands on. My sil once commented on how once I had a child, everything I thought I knew would go out the window. I resented the implication that I didn't know anything and that it was pointless to learn anything. I am so happy to report that everything HASN'T gone out the window. Some of my expectations of myself have had to change--I've learned how human I am--but I'm still totally committed to AP, and I'll bet that you will be too. I would say that as long as it's the underlying philosophy that you're committed too, more than all of the actual tools, you'll be OK. Because it's true that each child is different and what you think may work, may not. You won't change your mind about any of the things you've mentioned. Even if, heaven forbid, you had problems with bf or something, and if the worst happened and you weren't able to--you wouldn't change your mind, you would just figure out how to adapt your situation in the best way possible.
I feel strongly that the more prepared you are, with the most study and thought behind your ideas, you will be off to a much better start. I went through 7 years of infertility, so I had plenty of time to think about parenting, to watch other people, etc. I'm glad I had it. It made a difference.
One of my pet peeves (here at MDC and anywhere else in real life) is people who complain about childless people. I hate the stereotype that childless people know nothing about kids, that childless people are selfish and care only about their oh-so-non-important concerns, and couldn't possibly ever understand mothers. It bugs me when moms talk about how now that they have a child, they need to "move on" from their old friends. I am so glad my friends didn't do that! It is important to have people who understand literally the things you're experiencing, but I just wish we could all be one big happy family, seeing others as real, whole people instead of roles (or lack of roles).