Using your Klein Tools 63318 bolt cutter is easy. First, make sure you've identified the type of metal you're cutting and that it's within the cutter's capacity. For a 90 - degree cut, use the flat ends of the handle grips. Just place the metal between the jaws and apply pressure. When using, always wear safety goggles to protect your eyes from any flying debris. As for maintenance, keep the jaws clean after each use. You can use a dry cloth to wipe off any dirt or metal shavings. Periodically, check the lockplate to ensure the jaw bolts are tight and the jaws are properly aligned. If the blades get dull, you can replace them with the 63818 replacement blade.