It's straightforward. You can lift the head with manifolds attached but they'll have to come off for a shop to check the valves (guides, seats, etc.). I think you can lift the head leaving the manifolds in the engine bay. The stub hose between the water pump and head ranks among the top 10 MB bonehead design moves. The horseshoe gasket between the front cover and head might qualify.

Sixto
98 E320s sedan and wagon