Using the DeWalt DCF809B is easy. First, make sure you have a compatible 20V MAX* battery (sold separately) and insert it into the tool. Hold the impact driver with a firm grip on the ergonomic handle. Use the variable - speed trigger to control the speed based on your task. For delicate surfaces, use a lower speed for more precision. When working in dark areas, the three LEDs will automatically light up to help you see what you're doing. As for safety, always wear appropriate protective gear like safety glasses. Keep your hands away from the moving parts. When you're done using the tool, remove the battery to prevent accidental activation. To maintain the tool, clean it regularly with a dry cloth. Avoid using abrasive cleaners that could damage the tool. If you notice any issues or the tool isn't performing as well as it should, refer to the 3 - year limited warranty for support.