If you've never done this before, it's a genuine PITA.
First, jack up the rear of the door slightly to take some weight off hinge.

Next, remove the interior trim panel to access the single hinge bolt from the inside of the car.

Now the fun really begins. There is a bolt on the outboard side that is quite difficult to even see, let alone remove it. I used a slimline end wrench to grab it between the door frame and the roller pin.

After this bolt is removed, jack the door up a little more and the entire hinge slides out toward you. Remove the worn bushings with a small drift, install the new bushings. you can now put it all back together in reverse order.
It's important to note that getting that one outside bolt back through the hinge and into the threads requires a great deal of patience. Have a magnet handy... I assure you that you will drop the bolt down in the corner of the fender a half dozen times.
[This message has been edited by rpro (edited 02-06-2009).]