How do you remove the entire wiper arm on a 2004 blazer?

I'm not sure about your particular vehicle here. But if you don't see any nuts at the base of the wiper arm, you'll probably want to use a special tool. Usually these tools can be found at any auto parts store if you tell them what kind of vehicle you drive. They're generally not that pricey. It shouldn't be any different than any other. At the base of the wiper arm is a cap that lifts up. Under the cap is a nut. Propbably takes a half inch wrench. Unscrew the nut and pull off the wiper arm.