I seem to recollect that the first time the engine came out of mine I left the gearbox in the car. I then lifted the engine out, by hand, with my brother, accompanied by much cursing! On the second occasion, being a lone worker, I placed a trolley under the sump, disconnected all the control cables, wires, gearlever etc etc and lifted the car off the engine. I then wheeled the engine out from under the car and lowered the car back onto its wheels .... quite simple really.
Andy
PS should you be interested, the same MO may be used to remove an electric motor from a Southend pier train carriage. I did this, again lone working, in the middle of a field in N Wales. More difficult than with the Gussie .... a driven carriage for a Southend pier train weighs 6 tons!