Press the leather sheet down as close to the bike seat as you can in a desired starting location. Allow it to fold, if necessary.

Hold the staple gun directly against the leather and flush with the surface of the bike seat. Press down firmly, and staple the leather in place.

If the staple doesn’t go through on your first try, that is fine. Use the screwdriver to remove the staple, and try again.

Continue stapling the leather all around the bike seat until the leather is secure, folding or cutting excess as necessary.