Is this on a GTV or Spider? Either way, remove the wipers, plastic covers, and hold down nuts. Then any trim and holdd-down screws for the cowl cover in front of the windshield. Then pry it up gently away from the windshield. Maybe be tougher on a GTV with glued winshield. Once the cowl is out of the way, the wiper mechanism and motor are there as a unit.
Andrew
Andrew