everything in the birds time...just sit by the cage without your hand always being inside to have to do something which is like this HUGE CLAW to a bird...
sit there make yourself comfortable and do this for 15min twice maybe even three times a day so the bird doesnt always think your gonna eat or grab it when you approach...
this may take a week or even more but you dont want to rush or push the bird thru this very critical time...always move slow always speak softly very softly...
when your done...at the say midday sitting approach ...attach some nice big green leafy veggie to the outside of the cage so that doesnt frighten it either for awhile...when it tries to eat some thru the bars it will then associate you with being a good food time an will see you less as a threat and will even look forward to having you come to visit and talk with it

be sure your the only family member for now to do this too and be sure your cage is large as small cages make you and your hand even more intimadating to them ...as they have no where to go to feel safe in a small cage