Using your K&N Universal Air Filter is easy. First, find the right spot for it based on your equipment's air intake. Make sure the filter fits snugly; if it's a bit small, you can stretch the rubber flange up to 1/16 of an inch (1.5mm). When it comes to maintenance, clean it regularly. You can wash it with a gentle cleaner and let it dry thoroughly before reusing. As for precautions, don't use harsh chemicals on the filter as this could damage it. Also, check the rubber flange for any signs of wear and tear during cleaning. If you notice any issues, it might be time to replace the filter.