One of the most common problems to the pull shot, where the club swings outside and then into the left, is what happens at the start of the backswing. A lot of people might have great set up, great posture and tilt but on the backswing the right shoulder goes up, or rocks upward, not getting the club far enough off the target line. So that on the downswing the club goes out and over the target line producing a pull shot. What you would like to have happen is that on the start of the downswing you would like the right shoulder to go straight back away from you so that your weight goes directly to the right heel. This puts the club deep enough so that as it swings into the ball it will be coming into the ball more from inside the target line. A wonderful drill to help you get this feeling was given to me by Mike Dunaway. What you want to do is take a rope like a jump rope and loop it around something fixed like a bag stand and then just practice using your shoulder to pull one end of the rope backwards. You will feel the right side go straight back, it is very difficult for you shoulder to go up from there. So you will feel like the right shoulder goes back and then on the start of the downswing you can feel your right shoulder move on that inside-out path which takes your club more towards the target and not over the top. This is a wonderful drill to help you eliminate that pull shot.