Can an m30 engine with automatic transmission be removed and swapped without also removing the transmission?

Or, upon re-installation, must the tranny be refitted after the engine is in place?

How accessible are the 12 or so bolts holding the engine and transmission together, and how difficult are they to re-torque upon reassembly?

Bentley says to remove the exhaust and tranny, but I'm wondering if anyone with experience in engine swaps can suggest any more efficient methods.