Using the Milwaukee M12 FUEL 16 Gauge Variable Speed Nibbler is easy. First, make sure the battery is fully charged. Then, adjust the variable speed dial according to the type and thickness of the metal you're cutting. For thinner metals, you can use a higher speed, and for thicker ones, a lower speed will give you better control. When using the nibbler, keep it steady and let the tool do the work. The LED work light will help you see clearly in dimly lit areas. Remember to use the chip collection bag to collect the metal chips, which will make cleanup a breeze. As for maintenance, after each use, wipe down the tool with a clean cloth to remove any debris. Check the die holder regularly for any signs of wear and tear. Store the tool in a dry place when not in use to prevent damage. If you have any issues with the battery, follow the manufacturer's instructions for proper handling and replacement.