The truth is, you don't have to know the minutia of your spec, talents, or talent options. Purists will vehemently disagree with this, but that's why they're purists. They disagree with stuff. It's what they do.
All you need is a trustworthy source to give you your options. For many, this is Elitist Jerks. For me, it's my husband who uses Elitist Jerks. The other day, I waited forever to put 3 talent points in and then had my husband explain my new ability to me. He not only told me what it did but also how to maximize its effectiveness.
This form of learning how to play a class is acceptable to me. And, as far as my pugs are concerned, I do my job. As long as you learn the information, it doesn't matter how you get it.
This may make you ask "What do I do if someone wants to talk about my spec?" There are quite a few academic squabbles about specifics of spec, but if someone tries to argue with you about yours and you don't have an answer, there's a simple way to shut them down:
"I'll look into that."
How can they argue with that? They can't. Unless they're trying to pick a fight. Ideally, you will then talk to your source (whether written or verbal) about the matter in case the squabbler has a point.
Oh, and don't take your raiding habits from me. I'm writing this while waiting for the strat for Putricide to wrap up.