Using the DeWalt DCS369B reciprocating saw is quite simple. First, make sure you have a fully - charged 20V MAX battery (sold separately) and insert it into the tool. If you need to change the blade, use the tool - free blade release feature to quickly swap out the old blade with a new one. When starting a job, hold the saw firmly with one hand. You can adjust the speed according to your needs using the variable - speed trigger. For better control, especially in different cutting situations, take advantage of the pivoting shoe. When working in dark areas, turn on the LED light to illuminate your workspace. As for maintenance, after each use, wipe the saw clean with a dry cloth. Keep the saw in a dry place. Check the blades regularly for wear and tear, and replace them when they are dull. Also, from time to time, inspect the motor and other parts for any signs of damage. And remember, always follow safety guidelines and wear appropriate protective gear like safety glasses and gloves.