This one is a juvenile, mostly feathered and really grumpy about being handled. If I can get him to eat he'll have a good chance. At the moment I have to force-feed him. This is done by having holes pecked into my hands as I wrap him in a towel until only his head is poking out, then, while he swears and snaps at my fingers, I try to drop balls of food down his throat.
The most successful method is to shove my whole finger into his beak, then sneak the food into the side of the open beak below my finger. He doesn't like it much. I hope he works out that I'm a friend. That shouldn't take too many days.