Choke down on the club slightly, keep the ball back in your stance, place 60% of your weight forward and finish low
Keep your eyes directly over ball, shoulders parallel and putter face perpendicular to target line and head still
Focus on your left wrist at the top of the backswing and start of the downswing to get to impact properly, many players have a cupped left wrist which changes the angle of the clubface, this causes an open clubface and results in casting and manipulation during the last portion of the downswing