Practice makes...more practice.
Practice makes perfect. Cliche, yes. Inevitable truth, check. Pain in the ass? No.
I'm enjoying drilling myself by drawing constantly. I love it- or else I wouldn't be at my desk constantly doodling. I'm working on perspective, gesture drawings, the human figure, and scaling. All weak points in my work and something I desperately want to improve on. Luckily my talented roommate is giving his time to help me out accomplish these goals, but in the end its up to me to keep practicing. It's a lot like lifting weights. Repetitive practice.