Using these D'Addario EXL125 guitar strings is easy. First, remove the old strings from your guitar. Then, start by threading the new strings through the bridge and the tuning pegs. Make sure to tune each string to the right pitch. When you play, you'll notice the great tone right away. As for maintenance, wipe the strings with a clean cloth after each use to keep them clean and free from dirt and sweat. This will also help extend their lifespan. If you're not using the guitar for a long time, you can loosen the strings a bit to reduce tension. Always store the guitar in a dry place to prevent corrosion. And don't forget, these strings come in environmentally - friendly packaging, so you're doing your part for the planet too.