Using these D'Addario XT acoustic guitar strings is easy. First, remove the old strings from your guitar. Then, start by threading the new string through the bridge and up the headstock. Tune the string gradually to the right pitch. When you're playing, keep your hands clean to avoid getting dirt on the strings. For maintenance, after each use, wipe the strings with a clean, dry cloth. This will help remove sweat and dirt, and also extend the life of the anti - corrosion treatment. Store your guitar in a dry place to prevent the strings from rusting. If you notice any signs of wear or the tone starts to dull, it's time to replace the strings.