Good luck with your game, and please follow me on Twitter @RogerSchiffman
Many amateurs find the half-wedge shot to be awkward, and when sand or water are involved, downright scary. If you tend to hit the ball fat or thin, can't decide how big a swing you should make, or find yourself coming up long or short, try my system. It will erase your fear and give you the consistency and control you've been looking for.
When playing this shot, open your stance, play the ball forward of center, and aim the clubface at your target.
In the backswing, cock your wrists fully, but limit your arm swing. Then swing down and through, but end the swing when your arms are parallel to the ground.