Replacing intake elbow gasket

[C.A.R.]

I've spotted what looks like oil spray on the bulkhead just along from the EGR valve. I'm worried that the previous owner hasn't fitted the inlet elbow back with a proper seal, and it might have a little boost leak there? A new one was put on with a take-off for a gauge.

I've bought a new gasket, but have heard that this job is a bit of a bastard?

Any tips before I embark on it this weekend?

Boost gauge only hits 11psi peak, on a stage 1+, which I'm told is too low really...