I've had a serious problem for several years now with snap shooting.... the bad kind where your fingers let go of the string before you're ready to release. Started doing something that's helping, immensely.
I'd started trying Asbell's method of aiming while drawing and that's what really screwed me up. Always before, when I was a pretty good shot, I'd picked my spot, drew the bow to anchor and then began aiming. I've tried and tried to get that back but the target panic had too strong a grip on me.
A couple weeks ago, I started picking my spot, drawing somewhat high of the aim point, anchoring, and then lowering the arrow to aim. NOT skydrawing, just drawing about a foot high. It's really working well for me. I know I can't release the arrow until I get it down, so that forces me to hold that string back. Then I get the arrow down and take a moment to get right before releasing. 1,000% better!
Before, I was flingin' and hoping and now I'm aiming again. My misses were high, low, left, right... Now I'm shooting down the middle again and any misses are just high or low. The lefts and rights are gone. Now a miss is because I misjudged my aim instead of not executing the shot correctly. At the range last night, I even 8-ringed that godforsaken gopher at 25 yards!

First time I've hit that %$&! this year!
Shooting got to be a chore because I KNEW I was going to screw up on every shot. Honestly, I'd have hung it up long ago if it hadn't been for just going to the range to hang out with my friends. Finally, things are going right and shooting is fun again!