replacing hinge pins & bushings with p/w
Really not a problem. I supported the door with a floor jack and block of wood. Mark with magic marker completely around hinge locations on both the door and on the door jamb. If you don't do this, it will be a PITA to get it right again, this assuming you haven't messed with trying to move door hinges to compensate for bad bushings. remove only one hinge ass'y at a time. grind off swage where necessary. drive pin up to remove. Remove old bushings. reassemble in reverse order, being careful to align hinge halves with marks you made before disassembly.
The only problem you may find is that if left go for too long, not only are the bushings shot, but the hinge has been worn away, too, making the bushing hole oversize. Then you have to get serious. Remove entire hinge ass'y. Braze or weld bushing hole shut, then redrill to correct size. Then you can assemble as before.
Good luck