I shape mine with a 4x36 belt sander. Heavy grit on the drum end. If you want a smooth, professional finish you'd better get used to a rasp or file. After the sander, I caress mine with a half round file on the contours and the flat side on the flat wood. No mater how careful you are, any power tool will leave dimples. A file will smooth everything right out. You don't have to be a gorilla, just light, even strokes. It's quite therapeutic. Then start with heavy grit sand paper on a sanding block, go to the next grit and so on. I use a sanding block for all my sanding until I am at the 400 grit. If you use finger pressure, your fingers will follow the soft grain in the wood and make an uneven finish. Ask a professional auto painter if he uses a block or his fingers.