Using these D'Addario XT bass strings is easy. First, make sure your bass guitar is tuned to the standard pitch. Then, remove the old strings one by one and replace them with the new XT strings. Start with the light - top strings and then move to the medium - bottom ones. When you're done stringing, tune the guitar again to get the perfect sound. As for maintenance, wipe the strings with a clean cloth after each use to prevent dirt and sweat from building up. Avoid exposing the strings to extreme humidity or temperature changes, as this can affect their lifespan and tone. Also, don't over - tighten the strings when tuning, as it may cause them to break.