Now you can use a punch, vise grips or what ever to get the pins out. Once they are loose, wiggling the door up and down will get them out.
I used a brass drift to knock the bushings out. The top one of each hinge goes out by hitting them up and the bottom one of each hinge goes out by hitting down. The new bushings go in the reverse. Use a flat hammer to seat the bushing. To get the bottom bushings in, use one of the old pins after removing the clip and placing a 5/16" flat washer on the head. This keeps the new bushing from getting messed up by the knurls on the old pin.
Once all bushings are seated, clean the hinges as needed and grease the bushings. You then can line the door up for inserting the top pin. Remember it goes in from the bottom. Once it's started in both bushings, insert the bottom pin so it just starts in both bushings. This one goes in from the top. At this point I greased the pins where they will be inserted into the bushing the rest of the way. I wanted to make sure there was grease inside when done. Now drive the bushings home with a brass drift to seat the knurls and clips.
Now you can grease up the bracket that rides on the roller and install the spring. I compressed the spring in a vise and inserted 2 pieces of tie wire to keep it compressed. This is literally the hardest part of the job! Once you get the spring to stay compressed, insert it into place by closing the door 1/2 way then opening it all the way. You'll see where there is more room once you do this. Once the door is opened all the way, you can cut the tie wire and remove it. If you had a spring compressor, it would make life much easier.
Now open and close the door several times and admire your work!

Current rides:
2013 Toyota Tundra DC 4x4
2008 Dodge Nitro 4x4
2005 Nissan Sentra 1.8S Special Edition
Mileage spreadsheet
Vans owned:
1986 Safari 2.5L 4 speed manual - scrapped
1995 Astro 2WD conversion 4.11 posi, shift kit, DHC rock rails - sold to Skippy
1998 Astro 4x4 D44, D60, NP231, full hydraulic system with 9k# Milemarker winch and snow plow - sold to Lockdoc
2003 Astro AWD all stock - traded for a 3/4 ton truck
2005 AWD, 4.10's - sold to skippy