Cut the sandpaper to fit around a small, flat box (one that’s comfortable to grip with one hand), a sanding block, or an electric orbital sander (if you have one).

Cutting boards can be expensive, so it's always annoying when those inevitable little cracks show up. But you can fill them pretty easily with some wood glue and sandpaper. You don't want to live ...

I cut circular sandpaper by pressing a hole saw to the back of it, the paper side, to perforated the sandpaper, then tear it slowly. This produces a fair circle every time. I imagine a 3 inch hole ...

Perhaps when you’re cutting sandpaper you just have to accept that the process will wear out the sharp edge on your tool, regardless of which tool you use.