Using the DeWalt DW4910 cup brush is easy. First, make sure the power tool is turned off and unplugged. Then, securely attach the brush to the tool using the 5/8 - 11 arbor. Once attached, you can start using it on your workpiece. When using, keep the brush at a proper angle to get the best results. For safety, always wear protective gear like goggles and gloves. As for maintenance, after each use, clean the brush to remove debris. Store it in a dry place to prevent rust. If the wires start to show excessive wear, it's time to replace the brush.