Open/box wrench, no sockets. Not all bolts/studs/nuts will be accessible at the same time. Don't remember what order you can get to them in. Stick it up there and go for it. I had to back something off to get to another, so be patient and watch what you're doing. If you put that one on the...
Do they stop in the same place every time or just random location?
Random then I would suggest failed wiper motor not being able to find the 'open seeking' location.
Same place, possibly wiper arms installed wrong off position.