I've owned 8. Presently own two. Rehabbed dozens... more than I have kept track of. They can be huge clowns. They can be big green chickens. They can be very independent. They can be contrary and stubborn, (but not as much as a CAG.) With amazons it is in part about learning their body language, and in part not getting them too wound up.
And if they haven't been handled a lot, then you are starting over from square one. Just assume that the bird is not tame anymore. Start over with step up/don't bite...
One of the funniest UTube videos I have ever seen was the MOST classic, these humans just don't get what I am trying to say...
In it, the touristy woman goes up to a hot 3 amazon (I think it was a BFA) who is doing a classic amazon "line of death" dance display. Pacing back and forth on the spot, hunched over, making the "warning noises," eye pinning, tail flaired etc...

The woman thought the bird wanted to play with her!

"Look at that! He likes you! He certainly is friendly!" It was a territorial intrusion warning. The amazon "line of death" dance. One step closer and I will attack you! SO, SHE WALKED UP TO THE BIRD... CROSSING THE LINE OF DEATH, AND THE BIRD IMMEDIATELY LAUNCHED AT HER FACE! AND SOMEHOW, THIS WAS THE BIRD'S FAULT... "IT WASN'T VERY FRIENDLY AT ALL!!!"
So, that's the one aspect that people don't get...
The other aspect is that even calm gentle amazons can work themselves into a state. AMAZON OVERLOAD is very real. When they reach that threshhold, they WILL bite. You need to step back and wait a minute or two for them to calm down before attempting to step them up.
And food helps... particularly anything potato in my household. "Just put the french fry down, and no one has to get hurt!"
