Start early, train often, but don’t push too hard. We’ve all heard that old dogs have trouble learning new tricks, and the same principle holds true for just about any animal, including parrots (and people, for that matter!).
Begin the process of training your bird as soon as possible. So long as your parrot has reached the point of being capable (if not yet entirely willing) to eat a treat from your hand, you can begin training.
Hold multiple training sessions during the day, ideally at similar times each day for consistency, but more importantly when the parrot is in the mood for learning (that is, calm).
However, keep the sessions relatively short — no longer than fifteen minutes at a time. Once your bird begins to lose interest, it is best to end the session and begin again another time