How to do the Level Out Drill
Start with a short iron and take your normal set up. Then raise the club up about waist high and make some level practice swings swinging on a plane similar to that of hitting a baseball.
After you have the feel of coming into the ball on a more level angle of attack the next step is to try to apply that feel to a shot.
Begin hitting balls trying to feel more level as you come into the ball. Every couple of swings alternate between practice swings and actual hits.