I find when I'm hitting the ball poorly it's because the ball creeps too far forward and I start hitting with my shoulders too open. I move the ball back in my stance slightly and keep my left shoulder from opening to early. Also, I make sure my left arm is straight. When I get lazy, I start leaving the ball to the right.
I had to grab a club to think what I do when starting my downswing.
The butt of my club is dropping toward the ball. My right arm stays pretty close to my right side. My right hip is rotating toward the bal, the left hip away and backl. My main swing thought is to keep my head still and throw the club at the inside back of the ball. When I do that, I hit a nice little draw.
Over swinging is usually death.