^^ what he said, OR you could get the stats you're aiming for on a private server, made for pking, and try it there. Either ones good, like fist of guthix has more less-talented people just going there to upgrade their druidic robes and whatnot, yet there are challenging fights, where they have beast defence and good prayer-switching.
private servers don't have the best of players, and some don't have recent updates and all, but you can still get the feel of item-switching and all that. i'm actually going to get warmed up again at fog when my main gets unbanned, and try that way of practice out. sounds like a good idea