I am volunteering at the Aviry and Zoo of Naples as a bird socializer. I think the main reason I got the position is because they know I am not afraid to handle a bird if I know it bites, and still I stay calm and deal with the bites.
They have two green 6 month old irns. They got them in after they were weaned, possibly by parents. They have not been able to sell them because they lunge when you put your hand in the cage and then when you get them out they tear up your hand. The only way people were able to handle them is to grab them with a towel. They would not perch either.
By the end of my first day volunteering, I had bloody hands and now I have bruises and beak cuts all over my hands, wrists, and arms BUT I had them perching on my fingers, even stepping up a little. The next trick to teach them is to NOT randomly swing their heads down and take a chunk from my fingers or hands! My hands were raw by the end of the day, but well worth it. I hope I can tame these pretty little babies.
If you think an angry irn bite is bad, try an angry Senegal bite......DOUBLE the pain
That is the other "trouble" bird I'm working with. I am getting good progress with him too.
I really think the major trick is to show them you're not afraid of their beaks and when they lunge
and feeling guilty of giving less attention to Jazzy because I wouold get another fid after she is used to so much attention! I've got it worked out in my head! 
lol Season is coming and Joe is busy at work. I'm all alone and lonely. I need friends so I'm not so depressed!
Most people use it for bad reasons though 
