How do you change hinge pins on a 2000 blazer?

You probably don't need to change the pins, just the bushings (unless you let the bushings wear through to the pins). If you need to replace the pins (or bushings), first you need a stool or crate (to set the door on) or someone to help you, since the door is surprisingly heavy. Next, hammer a tap (or a Flathead screwdriver) onto the bottom of the pin until it is free (falls out). You may need a Flathead screwdriver or chisel to pry the bushings out of the hole Replace the pin and bushings. Check the pins for wear, and if there is none, put them back. It seems like an ordeal, but it is actually pretty mechanical and simple.