Its harder then you think, i got rather annoyed doing this job. The original rubber gaskets are good because they had a little ridge so they stayed in position on the head, the new cork ones I got didnt stay there at all.
So what I did was got some special gasket glue and put some dabs on some edges and stuck it in place to the head, then with 2 people put the rocker cover back ontop, trying to align the 2 long bolts is the hardest aart with keeping it all aligned and not mving the bloody gasket!
My tip would be, stay calm, have a helper and buy the bloody rubber ones with the grooves so they stay in place! Cork ones are annoying!
ALSO, DONT OVERTIGHTEN THE BOLTS...