Using the DeWalt DCST972B 60V MAX* string trimmer is straightforward. First, make sure the tool is turned off and unplugged before you assemble it. Attach the auxiliary handle and guard for a better grip. When you start trimming, adjust the swath according to your needs. You can use the variable trigger to control the speed, and choose between high and low settings depending on the thickness of the grass or weeds. When it's time to re - spool the line, use the quick - load spool feature for a hassle - free experience. Here are some important notes. Always wear safety goggles and gloves to protect yourself. Don't use the trimmer in wet conditions to avoid electrical hazards. As for maintenance, regularly clean the trimmer after use to remove dirt and debris. Check the line regularly and replace it when it's worn out. Keep the motor well - ventilated to ensure its long - term performance. With proper use and maintenance, this string trimmer will serve you well for a long time.