brian whatcott writes:

Let's see: would I know to turn on the two hydraulics control breakers,
the FMS1 and the FMS 2 breakers, spin up the APU , turn on the pneumatic
manifold to spin up one main engine, select radio frequencies via the
FMS CDU, initialize the INS - and on and on.....

Yes.

Of course, you wouldn't need to know all these things just to land the
airplane, particularly with help from an instructor on the ground. But you'd
need them to fly the aircraft competently, and you wouldn't learn them in a
Cessna. In any case, when it comes to landing the 747, a Cessna pilot
wouldn't really have any clear advantage over a non-pilot--the few things he
might know how to do would either be useless on a 747 or would be too trivial
to help without assistance.