Years ago, my method for cutting holes in installed drywall was to use a sharp utility knife and some elbow grease. Now I get out my oscillating multitool and fit it with a used metal-cutting blade. The blade easily follows the cutline and slices through fasteners, and it never goes too deep. I can let it run just below the surface and cut the drywall into easily managed chunks. The tool makes very little dust, and it absorbs the wear and tear that otherwise would have gone to my arms.
—Roberto Roman, Las Vegas