Using your DeWalt DWA8282 Flap Disc is easy. First, make sure your grinder is turned off and unplugged. Then, attach the flap disc to the grinder according to the grinder's instructions. When you start using it, apply gentle pressure on the surface you want to grind. Let the disc do the work. It's designed for fast material removal, so you don't need to push too hard. As for safety, always wear safety goggles to protect your eyes from flying debris. Also, use a dust mask to avoid inhaling dust. When it comes to maintenance, after each use, clean the disc gently with a brush to remove any debris. Store it in a dry place to prevent rust and damage. If the disc starts to wear out unevenly or loses its cutting ability, it's time to replace it.