Having some bird experience, even with a smaller/different species will only help you. The beak is a fear you must overcome! Being on the receiving end of a good bite is the only fix to get past that hangup IMO. The first bad bite I got was from a cockatoo when I was only 3 or 4 years old myself (I grew up in a house with multiple large parrots). My parents, after both me and the bird calmed down, made me hold him again later that day so I'd get over any hang ups about the bird having bit me ASAP. Couldn't have a kid terrified of birds in a house full of birds. You will likely get a few good bites in before your bird learns it really hurts you when he does that, and more importantly, that you aren't trying to hurt 'him' so there's no need to be so defensive to communicate. With my bird, I took a page from the old school how to tame a wild bird book and used thick gloves and a stick until trust was built on BOTH sides. This is a last resort option though and most birds don't necessitate such measures so don't be freaking out
My bird was just too aggressive to train any other way due to his background and eventually the gloves came off and the stick became for just when he's hormonal or overstimulated. Keep in mind my guy had 10 years of good reasons to hate and lash out at humans when I brought him home. A baby bird is simply not sure whether to trust or not and likely won't be out for blood. Another good thing to know- it is ALWAYS the humans fault when a bird bites, never the birds. Having this mindset from the start is perhaps the key to having a bird who almost never bites. When you understand why your bird bit you (it is never for no reason) you can better avoid the actions that led to the bite in the future, thus preventing future bites. You should also familiarize yourself with bite pressure training, which aims to teach a bird to more "pinch" when they feel the need to make a point rather than bite. I can't even remember the last time I got a skin breaking bite from Kiwi (years) but he will give a warning nip on occasion. He knows full force bites hurt us because I've shown him what he's done every time he's bitten me since I brought him home. These days, he has no reason to want to hurt us even if he's grouchy or we've done something wrong and he wants to let us know.
As for time to acclimate? I say amazons are not that "sensitive" and that the general personality types you'll find in larger amazons doesn't do well with being 'coddled'. Some parrot species need that, but not amazons. They need a strong leader, firm rules and to start learning the new routine from day one (ok, perhaps let them settle in for the rest of the day once home, but bright and early the next morning, time to start learning the new flock rules!). In nature, when they leave the nest they have to adapt to the 'customs; of their flock or die. It's perfectly natural and normal for a baby bird to jump right into learning the rules and behaviors expected of it. No wild flock of parrots waits for a newly fledged baby to "acclimate" either. (In case you can't tell, I believe firmly in playing into their nature for a well adjusted bird).
Have the cage set up where you plan for it to be (preferably, the living or family room where the most action is). If there are children or other pets that will be around, bring them around to see the new bird right away and start teaching them how to act around the bird too. As it is unlikely the bird will be step up trained, you will want to start building trust by sitting near the cage and reading out loud (doesn't matter what, the bird doesn't care) in a soft, soothing tone. Have some sharable snacks (fruit, veg, unsalted nuts etc...) you eat on (make a big deal of how yummy too) while talking to the bird. When he's interested enough in the snack to come closer, offer him some through the bars. Sharing "your food" lets him know you're accepting him into your "flock". This helps the bird get used to your voice and presence. Once he's comfortable being around you and taking treats confidently, then step up training and after that it's a cakewalk
Bringing your bird into the fold as soon as tolerated and starting to get over fears right away will help them build confidence. Amazons are not overly cuddly parrots, but they are friendly and do like being nearby as much as they can so have a t-perch or portable play stand as soon as he starts stepping up reliably and coming out of the cage. Bring your bird with you for ANY activity, regardless of how mundane, he can be present for. As time goes on, you'll want to start socializing with people outside the family and eventually start taking him out and about with you.
Not sure where everyone is today (?), but there's a good sized group of regularly posting amazon owners on this forum. Don't be afraid to ask questions either. 
Fortunately, being owned by an amazon is the only cure
