Using the DeWalt DCE555B is a breeze. First, if you need to change the bit, take advantage of the tool - free bit change feature. You don't need a wrench, just swap it out quickly. When you're ready to start cutting, press the forward - positioned on - off button. It's easy to reach and use. The LED light on the tool can be very handy if you're working in a dark area. Just turn it on to see where you're cutting clearly. As for the depth guide, set it to the depth you need for consistent cuts. When it comes to maintenance, keep the tool clean. Wipe it down after each use to remove dust and debris. The dust - sealed switch helps protect the tool from dust, but it's still a good idea to keep it as clean as possible. And if you're using the Tool Connect™ feature, make sure the chip (sold separately) is properly inserted. Also, always store the tool in a dry place to prevent damage. When not in use, you can use the belt clip to keep it within easy reach.