Using the DeWalt DWE7800 drywall sander is easy. First, attach the sanding paper or mesh to the 9 - inch hook - and - loop sanding pad. Connect the sander to a compatible DEWALT dust extractor using the Airlock™ connection. Adjust the variable speed dial according to your specific application. Use the dual - action trigger; press it momentarily for short tasks or lock it on for longer sanding jobs. When using, keep the articulating head at the right angle to reach different parts of the drywall. As for maintenance, regularly clean the sander to prevent dust build - up. Check the sanding pad and replace it when it shows signs of wear. Always unplug the sander before cleaning or making any adjustments. Also, store it in a dry place to avoid damage. If you have any issues, refer to the user manual or contact DeWalt's customer service.