You're going to have to endure a lot of scratching during the taming process. First of all, when you pick him up and he starts to claw you, make sure you don't put him down until he's calm. I know that sounds painful, but it's the quickest way to a tame iguana. My guy was a frantic mess when I first got him, but constant handling made him as calm as a cow within a few months. And it helps to have him in contact with lots of other people besides yourself. It's pretty much the same with all animals, the more love and attention you give them, the friendlier they'll be.
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~*Chibi*~
Sir Iggy ( 1.0.0 El Salvador Blue Iguana), Ryo-ohki, Orion, Bud, & Finnegan (3.1.0 crazy kitties), Rosebud (0.1.0 cockerspaniel), and Kayko (0.0.1 leopard gecko)