Using these D'Addario XT acoustic phosphor bronze strings is easy. First, remove the old strings from your acoustic guitar. Then, thread the new strings through the bridge and the tuning pegs, making sure to tighten them gradually until you reach the right pitch. When playing, enjoy the natural tone and feel these strings offer. As for maintenance, wipe the strings with a clean cloth after each use to remove sweat and dirt. This helps keep the anti - corrosion treatment effective. Also, store your guitar in a dry place to prevent the strings from rusting. If you notice any signs of wear or loss of tone, it's time to replace the strings.