Using the Ernie Ball Pegwinder Select is super easy. For string changes, just place the socket head over the tuning key and turn it. This will wind or unwind the string quickly. If you're using it on an acoustic bass, you can also use the integrated bridge pin puller to remove the bridge pins. When using, make sure the socket head fits properly on the tuning key to avoid any slipping. As for maintenance, keep it clean. You can use a dry cloth to wipe it after each use. Store it in your gig bag or a dry place. Don't use it with excessive force as it may damage the non - abrasive socket head. And always check if it's the right fit for your instrument's tuning keys before starting to use it.