Rag coupler shield removal

[Paul Stubbs]

So this is what's going on.

Attempting to remove exhaust manifolds on my 73 Brougham. I have removed all but one, and it is behind the big steering coupler rag shield. Is there a trick/maneuver to access the nut or do I have to remove the shield?
And how is this accomplished?

Thanks for any words of wisdom!