There is no "true" 100% way to tame an Iguana or any reptile for that matter. Each one has their own personality and each owner has to find his/her own way that works best. I'd say just take all the info that various people have had success with and see what works best. I think the one thing everyone can agree on though is patience, and that's probably what ended up putting that Ig you have into a shelter. Someone just gave up.

So on that note, if you need any more advice or help, just let us know, that's why kingsnake is here.