Using these 5mm plastic bevel LED holders is a breeze. First, find your 5mm LED. Then, simply insert it through the opening of the holder. You'll hear a snap when it's in place, which means it's securely held. Remember, these packs come with 5 holders and no LEDs, so you'll need to get your own LEDs separately. As for maintenance, just keep them clean and dry. You can use a soft, dry cloth to wipe them if they get dirty. Avoid using any harsh chemicals as they might damage the plastic. Also, when you're done with your project, store the holders in a cool, dry place to keep them in good condition for future use.