Using these D'Addario XT electric guitar strings is easy. First, loosen the old strings on your 6 - string electric guitar and remove them. Then, attach the new strings one by one, starting from the top string. Make sure to tune them carefully to get the right sound. When it comes to maintenance, keep your guitar in a dry place to prevent the strings from corroding. After each use, you can wipe the strings with a clean cloth to remove sweat and dirt. Also, if you notice the strings losing their tone or getting dull, it's time to replace them. Don't over - tighten the strings as it may damage your guitar's neck or the strings themselves.