i started out with photoshop and could never use gimp properly. though i did give it a try, it just wasnt memory-hoggy enough. erm... i mean feature rich.
but i used to use ps for school and work. had many of the command shortcuts memorized. in any case, if you dont have any experience with ps, then get gimp. its free. learning curve isnt so bad. there are some tutorials on how to do things at various websites. last i checked was 2005 so i really dont know if they still exist.
anyway, good luck!

or perhaps one of us can do it for you!! rawr!!!