Using these D'Addario EJ65T tenor ukulele strings is easy. First, make sure your ukulele is tuned to the standard GCEA. Then, replace the old strings one by one. When installing, be gentle to avoid breakage. As for maintenance, after each use, wipe the strings with a clean, dry cloth to remove sweat and dirt. This helps to keep the strings sounding good and lasting longer. Also, store your ukulele in a dry place. If you notice any signs of wear or if the sound quality drops, it might be time to replace the strings.