Using the Milwaukee 2486 - 20 Straight Die Grinder is easy. First, make sure the battery is fully charged and properly inserted. Then, choose the right accessory for your job. When you're ready to start, simply press the variable - speed trigger. You can adjust the speed according to your needs using the 3 - Mode RPM control. For safety, always wear protective gear like goggles and gloves. Keep the grinder away from water and don't use it in wet conditions. After use, clean the grinder with a dry cloth to remove any dust or debris. Store it in a cool, dry place. If you're not going to use it for a long time, remove the battery. This will help keep your grinder in good condition and last a long time.