On a specialty shot like this, the secret to pulling it off is in your setup. Copy the positions at right, and then follow the swing cues above.
1. Take a wider stance so that the insides of your heels are in line with the outsides of your shoulders.
2. Set the ball in the center of your stance, and then open your stance so that your hips and shoulders point at least 30 degrees left of your target.
3. Rotate the club to the right so that the face is wide open.
4. Lean the shaft forward and visualize that same lean later at impact to promote a downward blow.
You don't want to start off fast and long and then slow down. That leads to deceleration. Make a shorter backswing, stopping your hands between halfway to three-quarters back.
Smoothly speed up so that the fastest part of your swing occurs as your club is digging through the sand. Use your body turn your chest and hips toward the target as you power your wedge through impact.