Ok.... its not a rivet that keeps the gas pedal in place. Its a rubber cap thats on top of a allen head screw. Pop it off, an allen head screw is underneath. Pull the pedal towards the engine, and it will slide off. Un plug the cable.

Plug the cable on the new gas pedal. Slide the pedal in the metal tab that holds the top part of the pedal. Screw the pedal in place. 5 min mod. The brake pedal is self explanatory.... simple remove and replace.