Using your K&N universal air filter is easy. First, find the right spot in your equipment where the air intake is. Make sure the filter fits snugly and use the rubber flange to secure it in place. If it's a bit tight or loose, you can stretch or adjust the flange as it can stretch up to 1/16 of an inch. When it comes to maintenance, you don't need to replace the filter often. Just wash it when it gets dirty. You can use a mild soap and water to clean it gently. Let it dry completely before putting it back in. As for precautions, don't use harsh chemicals to clean the filter as it might damage the rubber flange or the filter material. Also, check the filter regularly to ensure it's still in good condition and providing proper air flow to your equipment.