To be honest,
I've already played every class in PvP (Pre BC) and I guess 6 lasses (in BC) never had a Problem with any. I'm not the uber Pro but I kinda know what they do to me, and keep that in mind.

Watching PvP Movies helps a lot and is most of the time entertaining. (In my case, but I'm also a Copycat, if I see something I can Copy it almost perfectly kinda)