How Involved is Redoing Valve Cover Gaskets

I have a 93 Lumina with the 3.1 in it and it is starting to leak oil badly. Probably about 2-3 qts a week. It looks like it is the valve cover gaskets causing it. My question is: How involved is the process of replacing the valve cover gaskets on this car? I've replaced them on other cars before, but they were the older vehicles (RWD V8). I know the rear cover will be horrible. What actually needs to be removed for that one?

Check the how to at autozone.com, repair guides.