The last thing I'd do is recommend that you find a 'PK coach', everyone started somewhere; nobody started as a brilliant PK'er.
For some it takes years, for some it can take only months or weeks. Start on RSPS, what most people don't know is that most people started there. For me personally I started bridding/nh'ing on Exiled years ago and now I would (modestly) call myself a v. good brid, but even now after years there are people better than me.
Practice, practice, practice. That's all it takes.
P.S If you need some tips feel free to private message me and I'll hit you up with my skype.