Confusion about when it's my navigation, and when it's ATC

TxSrv writes:

Brilliant. How do we get there in the first place?

If it's above the ceiling of the aircraft, you don't.

Barring extraordinary
ridge lift in winter-cold air, and maybe that would be
insufficient, how do we get to FL 300 like I've done in MSFS
in a 172?

You don't.

The point is that, since you cannot test the real aircraft at that
altitude, you don't really know how it would behave. And so you don't
necessarily know if the simulation is accurate or not. Simulation
allows you to magically place the aircraft at that altitude. In real
life, you'd have to climb to that altitude. The only exception might
be a drop from a larger aircraft, which would indeed allow you to test
it at high altitudes. It's hard to see any use for that, however,
beyond satisfaction of curiosity.

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