Using the DeWalt DAH44 hole saw is easy. First, make sure your power tool is turned off and unplugged. Attach the hole saw securely to your drill or power tool. Mark the spot where you want to cut on the material. Then, turn on the tool and apply steady pressure as you start cutting. Remember, this hole saw is great for tough materials, but don't push too hard. When you're done cutting, use the large continuous slot to easily remove the plug. As for maintenance, after each use, clean the hole saw with a brush to remove any chips or debris. Keep it in a dry place to prevent rust. And if you notice the cutting edge getting dull, it might be time to replace the hole saw. Also, always wear safety goggles and follow all safety instructions provided with your power tool.