Using your Milwaukee M18 FUEL 2810 - 20 Mud Mixer is easy. First, make sure the battery is properly inserted. Then, you can adjust the 180° handle to your preferred position for maximum comfort. Use the variable speed dial, trigger, or lock - on button to control the speed based on the material you're mixing. For heavy materials like concrete or mortar, start at a lower speed and gradually increase as needed. When you're done mixing, remove the battery to save power. As for maintenance, keep the mixer clean after each use. Wipe it down to remove any debris. Check the chuck regularly to make sure it's tight. Also, store the mixer in a dry place. And don't forget to keep the chuck key in its on - tool storage for easy access next time.