yeah its a painful process as you have to be in a very uncomfortable position laying on the floor on your back while trying to turn the nut
i think you may need to disconnect the clutch/clip/bracket from the pedal to give you a little more room
i did it a while back,,,,so cant remember exactly what i did
i KNOW for sure we cut the two long bolts on the new unit for sure before we installed, as it saved a ton of time when bolting it back up.....those two bolts are just way too long and serve no real purpose except to give you back pain and make you swear