Using the Milwaukee M12 FUEL Right Angle Die Grinder is easy. First, make sure the battery is fully charged and properly inserted. Then, attach the appropriate 2' accessory. You can adjust the speed using the 4 - Mode RPM control or the variable speed trigger according to your task. When working, keep the tool steady and move it smoothly across the surface. Be careful not to apply too much pressure, as it might damage the accessory or the tool. For maintenance, after each use, wipe the tool clean with a dry cloth. Periodically check the battery for any signs of damage and keep it in a cool, dry place. If the tool isn't working properly, check the connections and the battery. And always store the tool in a safe place, away from children and moisture.