Try & relax a little. Get your sling tension right, lay as comfortably & naturally as you can and work on breathing & trigger techniques. If you feel you are rushing your shot.... stand off (lay off) and start again... if you 'know' you are about to force/botch a shot, stop what you are doing, and start again on that shot.
I know myself, when I try too hard, I tend to shoot worse than when I feel relaxed
