Head Up

A lot of the time people think that when they miss the ball, hit it badly or hit it in the teeth, this is due to lifting one's head, "Watch the ball" or "Keep your head down". This is not the case.  What needs to happen is once you have completed your backswing, start your downswing with your legs, transferring your weight on to the left side, therefore your weight is on the left foot at impact and you will not come up or "lift your head".