Using these D'Addario XT 80/20 acoustic guitar strings is easy. First, loosen the old strings and remove them from your guitar. Then, thread the new strings through the bridge and up to the tuning pegs. Tune each string to the right pitch. Remember, these strings have a corrosion - resistant treatment, but it's still a good idea to wipe them down after each use with a soft cloth to keep them in top shape. Also, avoid leaving your guitar in a very humid or hot environment as this can affect the strings' lifespan. With proper care, these strings will give you great sound for a long time.