Short answer: yes, I watched all of Clint's videos about argentine tegus, including the one showing how he target-trained Gus-Gus. These videos helped affirm my interest in adopting a tegu myself, but the one of the largest factors have been posts by @kaijutegu showing how intelligent and rewarding tegus can be as companions.
Before picking up my new friend from her old keepers, I bought a shocking pink dog toy to be our training target. I chose this specific shade because I personally am allergic to pink, and don't own anything of that color, which would make the toy uniquely associated with feeding time.
I stuck it on a stick and have been showing it to her when offering food. Her lack of appetite and desire to just nap (trying to brumate, I guess) make it a bit difficult with the training, since food is the main reward in that system, and if she's not interested in food, the rest just doesn't work.
The flip side of this is that she's not been trying to nibble on my hands as a snack, so there's that.
We're still establishing rapport, though, and having a solid foundation of trust is pretty much a requirement for any enriching interaction between her and me. I'm looking forward to when we get there!
She was being given up because of changes to her temperament, supposedly becoming cage-defensive and bitey, explained by her entering "guberty" (tegu puberty). I haven't seen a lot of that from her, but this may be because I'm a New Person and therefore Scary, I don't know.
She did bite my sleeve once while I was trying to get her from under a sideboard, but that was clearly because she felt cornered (which she was). After being extracted from under the furniture and on the way to the cage, she also scratched my wrist trying to wiggle herself free, but that one time was very different from her typical behavior. Since then the access to underneath the sideboard has been barricaded shut, so as to avoid repeating this situation, as neither of us enjoyed it.
I have been picking her up almost daily without incident since, so she's not quite the anger monster I was expecting.
Note on picking up tegus: My understanding is that the best way to pick them up is kind of like you would a bunny rabbit: the football hold. Scoop your forearm under the tegu's chest, tummy, and pelvic girdle, then gently grip the base of tail with other hand. My new friend hasn't objected to being lifted that way.
PS - This is not a blanket endorsement of all things Clint has ever said and done. I'm highly critical of his support of breeding spider ball pythons, for one, so don't at me. However the vast majority of his videos are filled with good information, and if he manages to prevent people from impulse-buying a venomous snake or a crocodilian, he's doing good.