Using the DeWalt 20V MAX 14-inch String Trimmer is a breeze. First, attach the guard and handle if they're not already on. Then, if you need to replace the line, use the QuickLoad™ Spool for a fast swap. When you're ready to start trimming, press the variable-speed trigger. You can adjust the power using the Hi/Lo speed-control switch depending on the job. For better performance, use the high speed for thick grass or brush and the low speed for lighter trimming. When you're done, fold the trimmer using the folding hinge and store it in a small space. As for maintenance, keep the trimmer clean after each use. Check the line regularly and replace it when it gets too short. Also, make sure to store the trimmer in a dry place to prevent damage.