cockateil hand training?

My cockateil has about five years and not handtrained. It was givin to me by our neighbors, who said that they wanted to give it to someone you care about him, because their son has not wanted more. I did my research and completley understands the responsibility, but do not get as educating. if the hand of ur stick u near or in the cage he will bite it and freaks out! In addition, he squaks much to the night when I'm trying also sleep! So everyone knows, or has links to how to switch to train a cockateil and convince them to stay the night at qiute? (I have aready sewing a cover for his cage, to be light and breathable material that blocks light, but it doesent help!) Thanx soooo much to!
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