You jus' need to practice...and practice...and practice.I had similar problems at the begining,but this is my 4th year of playin' streetball,and now i'm schoolin' everyone on the court(btw. i'm white).
The only problem 2 me is when i do the BoOmErAnG,i mean the D turns and everything,but the ball sometimes (rare) hits me in the head.Now you help me!