It's the same technique as throwing a ball. Look at the spot you want to hit, draw, anchorand release. Start at 10 yards, when your groups get in danger of tearing feathers or splitting nocks move back to 15 yards and so on. Remember form,form,form, practice doesn't make perfect, perfect practice makes perfect. I would suggest getting a copy of G. Fred Asbell's book "Instinctive Shooting".
Pretty soon you'll be worrying about this happening.[:@]