Robert, get one of those 4-in-1 wood rasps at any hardware store or K-mart. Use the two finer sides, starting with the finest to build a small angle, then moving to the side that looks like a series of small blades. When most of the angle is cut, go back to the fine surface to clean up. Follow with a sanding block with 60 - 80 grit. Go slow and develop a little finnese at first, then it'll start to go fast. Check your work with a little jig that you can easily cut from scrap. Remember to leave the outside panel untouched. Chris