Wiper motor removal

I am trying to remove my wiper motor on my 72 Duster. Before I proceed however, is there a correct way to do this so, I don't have to fix something that it not broken now. I see there is a 7/16 nut on the shaft which probably needs to be removed. Left hand or right turn..? Is there a way to hold the wiper levers from moving when trying to lossen that nut?
Too many questions and simply not enough experience :-)
Any help ?
Author: admin