Using the DeWalt DCS389B 60V Max Brushless Recip Saw is a breeze. First, make sure you have a fully - charged battery (sold separately) and insert it into the saw. Then, attach the provided blade securely. When starting to cut, hold the saw firmly with both hands. You can adjust the speed according to the material you're cutting. For softer materials, you can use a lower speed, and for tougher ones, crank it up to the maximum 3000 spm.
As for safety, always wear safety goggles to protect your eyes from debris. Don't use the saw in wet conditions to avoid electric shock. Keep your fingers away from the blade at all times.
For maintenance, after each use, wipe down the saw with a clean, dry cloth to remove any dust or debris. Check the blade regularly for wear and tear and replace it if necessary. Store the saw in a dry and cool place, and make sure to charge the battery properly according to the manufacturer's instructions.