Nice writeup on the procedure. I had the same problem (oil leak) and the parts are cheap and it is not hard to do. I had photos of this job on Webshots, but they sold the company and deleted the directories and comments (bummer, and a cautionary tale about "cloud" computing).

The 15 bolts holding the cover down have a shaft that screws in and then you tighten the nut until it reaches the shoulder. Once you reach that point, stop tightening. It is set to tighten only that far.

If you over-tighten, you snap off the bolt, which is no big deal, as it unscrews from the head. But I had to wait two more days for Pelican to ship me a new bolt.

Lesson learned.....

P.S. - someone mentioned using "sealant" for this job. The valve cover gasket does not require sealant, and I think if you tried to use some, it might actually make things worse.