Using your DeWalt DCF961GP1 is easy. First, make sure the battery is fully charged and properly inserted. Then, select the appropriate mode on the 4 - mode push button switch based on your task. For delicate jobs, use the PRECISION WRENCH™ mode to avoid overtightening. You can also use the variable speed trigger for more control. When working in the dark, turn on the LED work light. As for maintenance, keep the tool clean and dry. After use, remove the battery and store it in a cool, dry place. Check the BATTERYGUARD™ connection regularly for any signs of wear. If you're not using the tool for a long time, charge the battery every few months to keep it in good condition. Always follow the safety instructions provided with the tool to ensure safe and efficient use.