I installed the heat shield gasket and it took me about 2 hours. I didn`t remove the intake manifold. Just used the double nut method to remove the two upper studs from the cylinderhead. Then removed all the remaining intake manifold bolts, loosened one of the bolts from the bracket underneath the intake manifold and angled out the thin metal gasket. Squeezed in the Hondata gasket and installed everything back in reversed order.
Lost just a bit of coolant, topped off the radiator and bled the system. Sorted.