Using the DeWalt DCK483D2 20V MAX XR Brushless Compact 4 - Tool Combo Kit is easy. For the drill/driver, just select the right speed according to your task. When using the reciprocating saw, make sure to hold it firmly and let the saw do the work. The impact driver's three - speed settings can be adjusted based on what you're working on. Hang the work light in a good position for better visibility. As for the circular saw, always use the provided blade and follow safety procedures. When it comes to maintenance, keep the tools clean after each use. Wipe off any dust or debris. Charge the batteries fully before using them, and don't overcharge. Store the tools in the contractor bag when not in use to protect them from damage. Also, check the chuck of the impact driver regularly to ensure it's in good condition and can hold the bit tips securely.