The biggest thing that I found is to get an anchor point where you touch every time you draw. I touch my jaw bone and that way that part of your draw is the same every time. Next like the other guys said keep your bow hand lose you will toque the bow if you grip it too tight. Next do not move back until you hit consistantly at 10 yrds. then and only then move back do not take a couple shots at 10 then move back to 15 or 20 it will mess you up. PRACTICE PRACTICE PRACTICE and BE SAFE
GO back to the pro shop they will help I am sure the ones in my area are very good about it.