How do you replace a serpentine belt for a Nissan 200SX SE?

To replace the serpentine belt on a Nissan 200SX SE, first, ensure the engine is off and cool. Locate the belt routing diagram, typically found on a sticker under the hood, to understand the belt's path. Use a ratchet or a serpentine belt tool to relieve tension on the tensioner pulley, then remove the old belt. Install the new belt by following the routing diagram, ensuring it sits properly on all pulleys, and then release the tensioner to secure the belt in place.