Using these D'Addario NYXL guitar strings is easy. First, remove your old strings from the guitar. Then, thread the new strings through the bridge and the tuning pegs. Tune the strings to your desired pitch. When you're playing, you'll notice they bend smoothly and produce a great sound. As for maintenance, wipe the strings with a clean cloth after each use to remove sweat and dirt. This will help prevent corrosion and keep them sounding great for longer. Also, avoid over - tightening the strings as it may cause them to break. With proper care, these strings will serve you well for many playing sessions.