Noisy messy things! Haha.
Mmmmm... well depending on the baby I would most likely wait a number of years (hence the pairs producing offspring). Actually.. my Daughter doesn't like getting much attention form me, in fact the other day i tried to read her a book and she frowned at me and pushed me away saying "Noo!" And then went off and read the book by herself. She's a Daddy's Girl. And my son is different too, he loves attention of course.. moreso just being talked to (which is easy as ANYTHING) and he actually doesn't like being cuddled/nursed for longer than 10 minutes.. he's rather independant in that regard, and he's only 8 months!
My daughter learned with the smaller birds that you NEVER put fingers in cages, or near them. And she learned VERY quickly no matter the type or size of bird (we have Eclectus too) you ALWAYS give them their own space and let them come to you. The only animal she harasses is the cat haha. She will point at pictures of birds/parrots and point at the beak and say "Ow.."

She's a smart one. Both of my kids are very quiet and docile.
I held the cat for my son to 'hold' and pat and i expected him to grab the ears or fur and pull etc. but no.. he just watched me pat the cat and then continued to do the same and just hugged and stroked the cats fur. He's even gentler than my daughter O.O
My daughter used to run around the house with a Green Cheeked Conure on her shoulder. And learned to respect birds. So i know she and my son would be fine with a Macaw, fingers wise. But the next baby.. well.. obviously I don't know what he's like personality-wise but I have a feeling he's a shy one.
Regarding the attention.. You do have a point. 2 quiet kids are relatively easy to look after, in fact I still have plenty of time to do my Art AND watch some TV.. but then that's with 2 kids.. not 3..
And the noise. I never ever say "Shhh! You'll wake the baby!".. well..wait.. The only time I have said that was just the other day but only because the ONLY noise my son can't stand is my daughters shriek.. which isn't even her loudest noise.. for some reason he just hates it.. and he was sick. So I told my daughter to be shhh. But i try not to encourage quietness around my babies/kids, because then they'd have to be in complete silence to sleep.. instead of getting used to noise. I can vacuum, have the washing machine going, have one of the parrots inside and have a movie playing all at once and my kids still sleep fine. So that wouldn't be an issue.. and our neighbours strangely really enjoy the noise of our parrots when they squawk and go off.. >.> strange people.. lol
Oh yessss the socialization! I am VERY big on socializing birds.. or any animal really, with other people, animals etc and
especially children. 2 of our Green Cheek Conures i hand-raised quite a while ago were like perfect angels with my son (and he was only a few months old) and very gentle, never nipped, never sat on his skin, only his blankets/clothes and sometimes they'd sleep on his head >.> lol. Never went near faces though and if the child annoyed them, they just moved somewhere else, usually to me. The other 2 were still VERY good with children, but they had a very mischievous streak, so I'd never trust them if they got close to a childs face... and they wouldn't be afraid to nip if the kid didn't treat them perfectly. So yes.. VERY VERY big on socializing birds when they're young.
Thanks for all the input guys/ladies! ^^ It is very helpful!