Using the Milwaukee 2554 - 22 Impact Wrench Kit is easy. First, make sure the battery is fully charged and properly inserted into the tool. Then, select the appropriate mode on the 4 - Mode Drive Control based on your task. For precision work, choose the 1 - 3 RPM setting. When doing reassembly, use the 4th setting with Auto - Shut Off to avoid over - tightening. When working, keep the tool steady and let the 250 ft. - lbs. of breakaway torque do the job. As for maintenance, regularly clean the tool to remove dust and debris. Store the batteries in a cool, dry place. Also, check the tool for any signs of damage before each use. If you notice any issues, stop using it and get it repaired.