He needs to remove the Intake Manifold from the engine in order to have access to the intake manifold gaskets. What's basically involved is the removal of a lot of wire harnesses and vaccum lines and that pesky hidden bolt in the back of the manifold.
on another note, I found that you don't really have to remove the manifold from the engine completely. Basically you still have to remove most of the bolts that hold it down and the throddle body linkage but after that, you cn leave all of the hoses that are attached to the throddle body in place. What I did once (not on my car) was just disconnect everything from the pass side of the manifold and the fuel rail, etc and then just sorta FOLD the manifold over into the drivers side of the engine. Saved me a whole lot of time and I didn;t have to remove a bunch of the vacum hoses and stuff.