The hard part of learning the Amiga was never the hw, it was how to start up and exit while still having an environment that was alive.
I had a slim 68000 3rd-party reference thing with a metal spine so it would keep open nicely, and I had the Prentice Hall 68000 book. Plus the HRM ofc.
Knowing 6502 made it more or less straightforward to jump ship. A few finer details took some time to get an understand for, but it wasn't exactly a quantum leap (I know, that is not what it means, but can't we just use the inverse meaning that people seem to mistakenly exercise?).