I'm currently reading a book about iguanas. In one of the chapters in goes into detail on how to tame a aggressive iguana. Always remember that this is most likely going to be a long process of gaining your iguanas trust. I hope this advice will help. Good luck!

1. Slow movements
2. Don't pick up the Iguana from above body
3. Get a sturdy stick and wrapped clothing at the tip. Slowly pet the iguana with the stick, and if successful slowly start pushing the stick away from the iguana, and start using your hand to pet.
4. Always try to get your iguana out every day.