Using the DeWalt DCD799L1 hammer drill is easy. First, insert the battery into the drill until it clicks into place. You can then attach your drill bit to the 1/2 - inch ratcheting chuck. Make sure it's firmly secured. When you're ready to drill, press the trigger. Use the LED work light to see in dark or tight spaces. Remember, this drill is powerful, so start with a slow speed for more control, especially on delicate materials. When you're done using the drill, remove the battery and store it in a cool, dry place. Keep the drill clean by wiping it down after each use. Don't use the drill if it's damaged. If you notice any issues, have it checked by a professional. Also, always wear safety goggles and other appropriate safety gear when using the drill. With proper care, this drill will serve you well for a long time.