Using the Milwaukee M12 FUEL 3/8 Stubby Impact Wrench is easy. First, make sure the battery is fully charged and properly inserted into the tool. Select the appropriate mode on the 4 - Mode Drive Control based on your task. For precise work, use the 1 - 3 RPM setting. When doing reassembly work, switch to the 4th setting with Auto - Shut Off to prevent overfastening. When using it in tight spaces, take advantage of its 4.8 - inch length. As for maintenance, keep the tool clean after each use. Wipe off any dirt or debris. Store the batteries in a cool, dry place. And regularly check the battery charger for any signs of damage. Always follow safety instructions and wear appropriate protective gear like safety glasses and gloves.