Good point. I still think that leaving my hand there *that time only* was the right thing to do, but in the future, I'll avoid putting my hand where he's been known to bite in the past.
Still proceeding with the hand-offering millet while saying "birdie crack". I took one long piece and cut it up into shorter (1-2 inch) lengths so I could manage it better; my thinking is that **at some point** I might try resting my hand in such a way that the millet is on top of the flattened hand, just to see if he approaches. I've been able to hold one of those pieces in my fingertips, near him in the cage, and he goes for it willingly as long as there's no finger closer than the munchies. Aside from that, I'm trying to avoid putting my hand in his cage at all except when changing his dishes, as I really want him to forget about the bad associations from when he first arrived (chasing / grabbing).
He really likes hanging out on a bell toy I have fastened to the outside of his cage. Obsessively so, I'm beginning to think - may be time to change that out. Earlier today I walked over to grab a spray of millet and offer it to him; normally he'd bolt from that toy to his nearby bird tree when I approach, but today he didn't; in fact when he scrambled to avoid me, he wound up standing on the millet. I carefully moved the spray to the tree, about 8 inches away, and he didn't panic and flutter off until the very last inch. That's progress, I guess.
I had to laugh today: his bird tree has several flat surfaces, and I had left a spare perch (used when offering millet, to encourage him to step onto that). He was trying to get to a piece of dried fruit, and wound up standing on the perch - which rolled a bit as he stood there. If a bird can look confused, he did - but he persisted in going after that tidbit!
He's making sporadic attempts to fly. Yesterday and again today, he was standing on one of his out-of-cage rope perches, flapping frantically and going nowhere. I wondered if he forget to let go with his feet. He finally took off today, and flew about 15 feet to the kitchen floor. Then he made a pretty good vertical takeoff, swooped back to the family room, swung a hard right to avoid one of the half-round windows, passed by the other half-round, and bounced into the wall - OUCH!! He definitely squawked when he hit. He plopped down to the ground (fortunately there is a blanket folded up below where he hit), and he quickly took off again to his tree then his cage, so I guess he's OK!! His wing-flapping is always really loud, which surprises me; is that typical or just because he can't control things well yet?