door hinge pin and bushings

The hinge pins and/or bushings in my driver side door of my 77 are worn. The door rubs on the body. Door saggs.

Anyone ever replaced the hinge pins.
1)do you take the door off the hinges and leave the hinges on the body to repair?
2)do you take the door and the hinges off the body.
3)Can you replace the pins and bushings one at a time without taking the door off?

Any suggestions??