It's not that bad. I've done both my '74 and my son's '86 in the last year. Here's the tricks for the later style:
Remove the rear-most cotter pin or release the throttle cable at the throttle linkage FIRST !! Why? If that spring on the pedal is loaded and you pull the forward cotter pin, you'll launch the spring and little plastic end piece into the oblivion. You'll never find them again. Thank god MWB has them in stock. Not that I launched mine...
Remove the hand brake and pull out of the way, then grab the cable clip with a pair of channel locks and remove the clip.
Getting the new cable/shroud through the rear tunnel helps if you have a magnet on a stick. The bitch is getting it through the rubber grommet at the end of the cable tube.
At first I tried to pull this rubber grommet off the tube. It was on there, not coming off. So the trick is to use welding wire or something similar to fish from front to back through the tube and use it to pull the end of the throttle cable through the grommet.
I put a little bit of grease on it and it came right through
To install it on the pedal, assembly is the opposite of dis-assembly. Push the rod through the pedal and install the spring and outer clip first. Dispense with the cotter pins and get hobby store R/C car pins
Have an assistant pull the cable at the engine to compress the spring and let you install the rear pin.
Now put all the carpet and hand brake back together...