I decided to pre-cut some sandpaper for my hand held sander so that I did not have to stop and cut a piece every time I needed a new one. Use a ruler to pre-cut and file in order of grit, from fine to coarse and your next sanding job won’t take as long. Bonus, cutting the sandpaper will sharpen your scissors and you will know when you need to purchase any more of one kind of sandpaper.