Patience is the key with any larger lizard, slow movements, never approach from above, pull up a stool, have a seat and take your time.

Fast motion, approaching from above and forcing yourself on the animal will only make your lizard that much more scared.

Good luck!
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Regards,
Wayne A. Harvey
Thamnophis US
Savannah Monitors
Snakes and Lizards, It don't get any better....