Attach the strap to your guitar. One end of the strap should be at the bottom of the body of the guitar. Attache the other end either where the headstock meets the neck or where the neck meets the body. Fasten the strap tightly.
Place the strap over your head and right shoulder. The guitar will hang from your left shoulder (for left-handed guitarists the right and left sides will be opposite for you).
Adjust the strap if necessary. The top curve of the guitar body should rest anywhere from around the middle of your chest to the top of your ribcage.
Adjust the way your guitar lays against your body. The back of the guitar should lay flat across your front.
Play your guitar. Your right and left hands should be relaxed, and your wrists should not be bent; tension in your limbs can result in pain. If you experience wrist or arm pain, stop playing and adjust the guitar strap so that your arms and wrists can be relaxed while you play.