PS 1 is where I started, all self taught, but that's not saying much. Actully started digital imageing was with a Quantel Paintbox in '86.
I know it can do Sooooo much more then I do, I guess I do what I am Comfortable with and don't take the time to explore more avenues.
I own 2 PS WOW books and have only skimmed them because I hate to read.
I pick up from word of mouth (thanks for the sharping tip last year Eric) or video or the graphics people at work. yea, like they have any time
They only way I could be taught is by trying and repetition till I figured out what the hell I could do and what was going on, very painful, but I was so in to it that I didn't care.
Here is a video to get you started if your interested.
Video
Anything written by this guy is golden, The guru, as some say.