Lol, I've had it since CS3 came out and only just now managed to bite the bullet and jump in. I guess just do that, jump in and mess around with it.
Read/watch some tutorials too, they help a lot. Especially with just getting to know the interface and general workflow since it's so awkward at first compared to a normal NLE like Premier or Windows Movie Maker or whatever.
CreativeCow.net is an awesome resource for a lot of
tutorials.