I would first get this Macaw on your forearm ASAP, even if this means you getting bit over and over. You have to be the alfa in your realationship or this B&G will walk all over you.
It is very important to get a new Macaw onto your arm within the first 48 hours of the bird entering it's new home, everyday that goes by, it will get harder and harder for you. So now you can see how far behind you are.
The trick to getting your Macaw on your arm, is to press your arm gently but firmly towards the lower belly of the Macaw, almost to the point of getting them off balance, the Macaw will automatically move forward as not to fall, this is when you say everytime you want to hold your Macaw, Step Up, or when placing your Macaw on a T stand, back in the cage the words are always Step up or step down.
Macaws are very smart and learn very quick.
Always carry almonds with you once you are able to handle your Macaw and give treats only when they do something they are asked.
You advised that your Macaw will take treats from your hand while in the cage or when you open the door to give a treat, this is the first step in getting the macaw onto your arm. Don't stop there, when you open the door, ask your B&G to step up, if they do not, and run to the back of the cage, stand your ground until they calm down, never close the door and walk away, if you do, you just taught your macaw that If I don't listen to my owner, she will leave me alone and I will do whatever I want.
After the macaw calms down, keep trying. If all fails, you will have to just go for it and reach in the cage and force the Macaw onto your arm. Once you get your Macaw on your arm, something wonderful happens, your macaw now sees you in a leader roll rather then someone who stops by the cage once and awhile.
When you get your Macaw on your arm, Keep you arm in a letter L position and close to your body, macaws want to feel save when being held. Keep the macaw away from your fingers and face, if you have long hair, pull it back so the Macaw cannot grab onto it.
Walk around the home so he can see that you are no threat to him and they are completely safe in your care. Introduce him to things in the home, closed windows, mirrors, doors, furniture. Allow them to touch things as this is how they learn what they can and cannot touch. Macaws are like having small children, they have got to look up to you, you are their new leader, protector, and most important, you are their new flock.
Bonding with your macaw is your next step, this means, do everything and anything you enjoy with them, include them in all areas of your life. Macaws are not dogs and cats that have free roam of your home, they are fluffy can openers and will get into everything. I eat with my both my birds, shower, take walks, drives. Go to petstores that allow animals. Bird club meetings. This is all bonding time and your macaw will learn to love you respect you and look for you for for the care and provider.
Please ask many questions, try to give info on things that you are doing, or trying to teach your macaw, we all have great advise and willing to help. Best of luck Joe
This has been the best advise thus far.
~Brenda~