How can i train my new baby finches?

ok, well i have 4 baby finches (3 days old) in the nest. ( i breed finches) And i want to train them to trust me and take food from me and sit on my finger. All my birds (parrot, atiel, and parakeets are trained) except the finch family. and i am giving 2 to my BFF and she wants me to help her train them. How should we start? Will they be tame enough to carry around the house? How long will it take? And i know its possible cuz my aunt had a tame finch. please help. im chosseing a best answer fast so be quick! Thanks yahoo people!