I did my own. Bought the Richmond gears on line and printed and followed step by step instructions off the internet. After I had it done I was so unsure of what I had done so I took it to a shop to have it looked at. Shop called me an hour later and told me I had installed and set everything dead on.

I was shocked as I had no dial guages or any real tools to speak of. Just a matter of taking the time and lots of patience. I remember using the paint that they give you and having to pull things apart a couple of times to get everything correct etc.