Using this heat shrink tube kit is easy. First, pick the right size tube for your wire or component. Slide the tube onto the part you want to insulate or protect. Then, use a heat gun or a lighter carefully to shrink the tube. Make sure to move the heat source around evenly to avoid overheating. When using a lighter, keep it at a safe distance. As for maintenance, store the kit in a cool, dry place. Keep it away from sharp objects that could damage the tubes. Also, check the tubes regularly for any signs of wear or damage.