This is not my first iguana. When he get bigger I'll judge his demeanor and adjust accordingly. I am very gentle with Buddha. He loves having his head scratched and always calms down when I do it.
To break him of biting and threatening to bite, I blow are into his open mouth. He closes it immediately. I talk to him and pet him after to reinforce a closed mouth. I also let him bite me sometimes; when circumstances dictate, i.e., when he just won't get out of a bad mood. This shows him that the bite has no effect. He used to knaw a little on me but now he barely hold on when he bites.
Of course I would not recommend someone trying this with a large iguana...
I intend to wean him off of biting totally... might he, down the road, remember his biting days and take a shot at me? Perhaps. But I'll be expecting it because I am careful. At any rate, bites are just a part of the iguana owning experience.
When he gets to be 1 or 2 hopefully he wil be a biteless, whipless(he does only rarely whip at present) iguana, like my last one. She was completely tame. Anyone could hold her tail. She would just lay on my belly while i watched t.v.
Well I'm done rambling, but I'm gonna post my Buddha's perch that I mounted in my window. He's free roaming. Packing tape is my new best friend.