Using the Klein Tools DK06 duct knife is a breeze. When you need to cut duct board or flexible duct, hold the knife firmly by its Cushion - Grip handle. You can choose the serrated edge for tougher cuts or the regular edge for smoother slicing. Make sure to keep your fingers away from the blade while cutting to avoid any injuries. After use, clean the blade with a dry cloth to prevent rusting. Store the knife in its puncture - resistant nylon sheath. This will not only protect the blade but also keep you safe from accidental cuts. Also, check the blade regularly for any signs of wear and tear. If the blade gets dull, it might be time to replace it. With proper use and maintenance, your Klein Tools DK06 will serve you well for a long time.