Using these D'Addario XT 80/20 Bronze acoustic guitar strings is easy. First, remove the old strings from your guitar. Then, start installing the new strings one by one, making sure to tune them properly as you go. When you're done, give the strings a gentle stretch to help them settle. As for maintenance, wipe the strings down after each use with a clean cloth to remove dirt and sweat. This will help keep the anti - corrosion treatment effective and extend the life of the strings. Also, try to keep your guitar in a stable environment, away from extreme heat or cold. If you notice any signs of wear or corrosion, it might be time to replace the strings.