Using the DeWalt DCK239E2 Combo Kit is a breeze. For the circular saw, first, make sure the battery is properly inserted. You can adjust the depth and bevel of the saw without using any tools. Just find the right settings for your project. When you start cutting, the on - board LED will light up dark areas. If you want to keep the dust down, attach the optional dust chute. When you're done, use the rafter hook to hang the saw for storage. For the drill/driver, it's great for all kinds of drilling jobs. The built - in LED helps you see in dark spots. Remember to charge the DCBP034 batteries regularly. They are powerful and compact, but they need proper care. Keep them in a cool, dry place. As for maintenance, clean the tools after each use. Check the blades and bits for any damage. If you notice any problems, refer to the user manual or contact DeWalt support. And always follow safety precautions, like wearing safety goggles and gloves.