That's the best way... to talk and to whistle him until it's used to you.
Try to offer him something he likes (sunflower seeds, melon...) first from outside, and then with your hand inside the cage. At the begining it won't take it, specially if is so skeptical

... just be patient. What I used to do with my cockatiel was the following: I offered her a sf seed and, after a moment offering, i ate it (or pretended i was eating it) So she could see i was offering food. IRN like to imitate too... so this can be a good method. Once it is used to eat from your hand inside the cage, it will be time to make it go up to your hand... and once it is comfortable on your hand, its time to let him out of the cage, always on your hand.
There are many methods to achieve the same goal... which one should you choose? Only you and Fiji know... and you will find it out being clever (if you don't know what to do, think you are dealing with a 2 year old boy)
If Fiji was hand reared, it will be easier... if not, it will take more time... but be patient! And If you are completely lost, just ask, I'm sure someone will kindly answer you!
