Welcome to the forum!
Air-assisted is actually
easier to learn with.
With palm push you have to build the muscle memory to drive the graver through the metal while simultaenously holding it back from sliding right across the plate.
With Hammer & Chisel (usually abbreviated H&C) you have to learn to control where the point is going by tapping on the back of the chisel, controlling both hands and a few other body parts.
With air-assisted you hold the graver in one hand, maybe have to co-ordinate using a foot pedal and the graver slides through the metal with just enough resistance to keep it under control.
With any method you'll learn how to make a line in no more than a couple of minutes.
But only with air-powered will you be able to
stop thinking about that and concentrating on what to
do with that line within a day or two.