when fitting the new gasket it comes with extra bits on it at the front and support pieces accross the center section. these help to keep the gasket together as it will flop everywhere if you remove them, anyway leave it all intact and fit the gasket into place on the head,you can cut the extra front bit off when the cover is on, the center cross pieces can stay in place.

the most important part is the corners on both sides of the front cam bearing supports, when the gasket is sitting in place put a small blob of sealant in the corners and then fit the half moon seals in place, and finally tighten up the cover evenly making sure the front half moon seals compress evenly and correctly
make sure you dont over tighten the cover as the gasket will spread over the edges and will leak. just a good nip when they all feel tight should do.

sorry about the rant on fitting one of these gaskets but they can be tricky and a pain in the ass if you have to do it twice.