Using the DeWalt DCH263B is easy. First, make sure the tool is properly assembled with the side handle and depth rod. Connect the appropriate drill bit to the SDS Plus chuck. When you're ready to start, hold the tool firmly with both hands, using the side handle for extra stability. Press the trigger to start the drill. You can use it in different modes depending on your task - drilling or chipping. When drilling, start at a slow speed and gradually increase as needed. For chipping, let the tool do the work and don't apply too much force. As for safety, always wear safety goggles and ear protection. Make sure the work area is clear of obstacles. If the bit jams, don't try to force it. Instead, release the trigger and check for any blockages. For maintenance, keep the tool clean after each use. Wipe it down with a dry cloth. Check the SDS Plus chuck regularly for any debris or damage. If the tool gets wet, dry it thoroughly before using it again. Also, store the tool in a dry and cool place when not in use.