They are sure cuties and very pretty. I agree with the suggestion to try to tame them separate from each other. I think it'd be quite a handful to try taming both at once, and one will take cue from the other to panic.

I didn't really read a book or get told how to tame my keets in the past when I had them, I think we just clipped their wings and then kept putting hand/finger in front of them and urging them to perch on a finger (saying "step up"). They would keep running from me and finger but I just persisted and persisted and finally I'd get him/her to sit on my hand. The moment that happened, I'd sit very still for as long as I possibly could, cooing and praising and just letting the bird gain a feeling that it wasn't dangerous. I kept that up and before long, they weren't afraid of a hand reaching out anymore. I think it is easiest with chicks not too long out of the nest box yet, but it's possible no matter what the age.

One thing I never did, which I probably should have, was handle them more as far as holding them. They seemed to get so stressed and frightened that I avoided doing it, but then when it comes time to clip nails or be examined they are more stressed, so it is probably something I should have done more.