I replaced my leaking rear driver side air shock this weekend. This write up is pretty spot on.
Couple things though... When I was pushing in the airline, I couldn't get it to seat. After a few minutes I thought maybe the line got a bit flared. I took a file and knocked the lip of the plastic airline down and it slide right in.

The other thing, after a couple minutes running the shock was still not inflating. I started getting stressed, but maybe after 4 minutes it inflated, so if you do this job, know that it might take a few for the shock to inflate.