Using your DeWalt DCST922P1 string trimmer is a breeze. First, make sure the battery is fully charged and properly inserted into the trimmer. Then, adjust the handle to a comfortable position for you. When starting, you can use the variable speed trigger to control the power. If you need to cut through thick grass, switch to the high - speed setting with the Hi/Lo speed control switch. When the line runs out, use the QuickLoad™ Spool to quickly replace it. Remember to always wear safety goggles and appropriate footwear when operating the trimmer. For maintenance, after each use, clean the trimmer to remove any grass or debris. Check the line regularly for wear and tear. Store the trimmer in a dry place, and if possible, fold it using the folding hinge to save space.