Using your DeWalt DCG412P1 grinder is easy. First, make sure the battery is fully charged and properly inserted. To change the grinding wheel, use the quick - change wheel release. You won't need a wrench. For guard adjustments, take advantage of the tool - free guard feature. When operating, hold the grinder with the two - finger trigger switch. You can use the lock - off button for continuous operation. The two - position side handle can be adjusted to suit your comfort and the task at hand. When it comes to safety, always wear protective gear like goggles and gloves. Avoid using the grinder in wet conditions. After use, clean the grinder with a dry cloth. Store the batteries in a cool, dry place and recharge them regularly to keep them in good condition.