Does the kit not come with instructions? I've not reviewed the kit, nor have I looked at the directions.
There is a guy on this forum that rebuilds door hinges and does a superb job. But the market for this is dwindling, and he seems to do them in batches. I recommend you use his service and have all your hinges rebuilt. If yours is sagging and it bothers you, I recommend you use his service. A search on this (and the e-bodies.org forum) will give you the data to find him. I've worked with his hinge rebuilds, and they are very nice.
He does more than replace the pins.