Hello Marine,
Kiwi's post was informative and if I may add to that as a bird trainer of hawks, owls and falcons as well as breaking in new birds at exotic bird stores and for people for 30 years, I'd like to offer up some advice.
First of all, it is a new member of your family, it will take some time. Move it away from any high traffic area and allow it to observe from a distance. Pull up a chair next to cage and talk to it. Read a book to it, show it pictures on lap top, sing a few songs. Have a treat with it, and offer to share your treat.
Birds chose there mates, or those humans it wishes to bond with, you don't chose it. That being said, the issue in your case involves trust and bonding. Once it trusts you, it will bond to you.
I tell everyone this, "ALL BIRDS WILL BITE" The ones that don't bite at all have not been discovered yet. They are NOT domestic creatures. They are wild, even though they may have been raised in captivity. Lions are raised in captivity as well yet they are wild animals that can adapt, they are still wild.
No Bird likes to be approached when they are preening, have their back turned, or sleeping, they will snap at you or bite.
Their cage is their safety zone, it belongs to them, respect that, and ask the parrot to get yum yum for them and they won't bite entering the cage. To them your stealing their food, they will protect their food and territory.
Amazons are not hard to train, a little harder than cockatoo's like Kiwi said, but they bond much better than a cockatoo, and understand spoken words much better than even an African Grey. The blue fronted amazon is considered one of the truly unique species of parrots that actually understands emotions as well as spoken words. Be care of the tone of voice used, even when bitten.
I use a time out for my birds, if they bite, they are told no, and put in their cage to cool down. after about 30 minutes I ask if they want out, my Grey will nod it's head up and down, my amazon will say "Yes, okay, up up, come on, come on, out out" they both won't bite then because they don't want to spend time in their cage. My birds are allowed out time most of the day. They have been conditioned to fun things, they want out, they behave, they bite or test me, they get a time out. which they don't like, but they learned to respect that and I respect them.
Establish who's boss.....Birds will bite to establish dominance, like chickens do in the case of a "pecking order", to a parrot your part of the flock, it wants to be boss over you, if you get bit then don't acknowledge it and run, I reach under my birds wings with first finger and little finger and raise them up above me when they bite, then back down, this releases any bite they have and establishes dominance over them. The under wing touch and tail base on top touch, pouch (under chin) is sensitive and usually only their mates are allowed to touch..... They change quickly after that, trust me, and a bird that normally bites and wants nothing to do with you will suddenly find you are their best buddy now. Works with hawks and chickens as well.

