Using these Deltana 4 - 1/2' x 4 - 1/2' Square Hinges is easy. First, measure your door and make sure it fits the hinge size. Then, attach the hinge to the door and the door frame using the provided #12 x 1 - 1/4' wood screws. When installing, ensure the hinge is properly aligned to prevent any issues with the door's movement. As for maintenance, clean the hinges regularly with a soft cloth. Avoid using harsh chemicals as they might damage the finish. If you notice any squeaking, a little bit of lubricant can do the trick. Just apply it to the knuckles and open and close the door a few times to distribute it evenly. With proper use and care, these hinges will serve you well for a long time.