Don't fret, don't worry! I think every artist goes through a "oh god what am I getting myself into?" stage.
Two things you should do. Don't be intimidated by other artists, and take it step by step, small steps first.
I can't think of any new artist anatomy books, but you can find many resources and tutorials that can explain it in a simple language and such. In fact, many of the tutorials I'm thinking of are in the big ol' tutorial thread on this forum.
viewtopic.php?f=9&t=15A handy tutorial right here.
http://cedarseed.deviantart.com/art/Big ... n%3Ascraps