To prevent a belt sander from tilting near the edge of a workpiece and rounding over the corner, place another board that's the same thickness up against the workpiece. This way, the sander rides across the edge and on to the abutting board instead of rounding it over.
If you have pets, consider replacing the carpeting before putting your home on the market. Many people are allergic to pets and extremely sensitive to pet odors, which even a recent, thorough cleaning may not mask. And worn carpeting, even if it is clean, can detract from a home’s overall appearance, giving the impression it has not been well maintained.