Using the DeWalt DCF801B is easy. First, make sure you have a compatible battery if you don't have a bare - tool version. Insert your desired bit into the 1/4 - inch quick - release hex. Select the appropriate mode on the 3 - mode switch based on your task. For more precise jobs, use the Precision Drive™ feature. When working, keep the work area well - lit with the 3 LED lights on the nose. Remember, batteries and charger are sold separately, so get the right ones for your needs. As for maintenance, keep the tool clean after each use. Wipe it down with a dry cloth. Don't expose it to extreme temperatures or moisture. If the tool gets dirty, you can use a mild cleaner. Also, check the bit regularly for wear and replace it when needed. Store the tool in a dry place, and if you're not using it for a long time, remove the battery to keep it in good condition.