it's lots of fun i just did mine this weekend...
So here goes
first, if you can get someone to help it'll make this process a little easier if not a floor jack works you just need something to hold up the door..
things you'll need first the door pins and bushing local auto parts store will have them next you'll ne a special tool to remove the spring from under the top pin. it look like a par of tongs but with a bolt through the middle holding the two peices together. A long punch, Hammer, pliers, and a flat blade screwdriver.
STEP 1: Take the spring remover and slid it around the spring and tighten the bolt this put more pressure on the spring causing it to shrink allowing you to remove it. once you get it out set the spring and spring compressor away from you so you don't bump it.
STEP 2: Take the screwdriver and pry the keeper clip off the top pin.
STEP 3: Now support the back of the door.. Then Drive the top pin out.
STEP 4: Lean the door one way or the other and drive the bushing out. Replace them with the new ones then install the new pin and keeper clip.
Repeat steps 2-4 for the bottom and then install the spring and your done.. took me about an hour but I took my door all the way off to "adjust" the hinge itself. The adjustment required a very complicated tool "a really big Hammer".
Hope this helps