I did mine while the instrument panel, ash tray and radio were out, which made it fairly easy. You also need to remove the wipers and front cowl vent panel to get at the wiper arm nut.
Some time ago when I needed to replace the heater control arms with the kit a got ( someone ) kindly sent me photos and instructions which I followed and got it done......
anything out there re the 2 speed wiper motor. appreciate it as allways!!!