Using the DeWalt D25966K demolition hammer is straightforward. First, make sure it's properly plugged into a power source. Then, insert your desired accessory into the 1 - 1/8' hex tool holder. Once it's securely in place, you're ready to start chipping away at concrete. When using the wireless tool control, pair the hammer with the DCV585 dust extractor (if you have it) to keep the work area clean. Remember to attach the DEWALT Tag if you want to track the tool's location. As for safety, always wear appropriate protective gear like safety glasses, gloves, and ear protection. Avoid using the hammer in wet conditions. For maintenance, after each use, clean the tool to remove any debris. Check the motor and other components regularly for signs of wear. If you notice any issues, contact a professional for repair.