I agree with most of what has been said on this thread, but that's unfair. I know people with one snake (or none) that are more experienced than anyone I've talked to. What's in your current collection shouldn't define your experience as a keeper.
That being said, I know people with dozens of snakes, lizards, etc. that I wouldn't take advice from when it comes to caring for a roach.
I do agree when it comes to keeping Monitors you should SUCCESSFULLY kept (or still keeping) one to give advice. I could have regurgitated information about keeping them all day, but it takes actually keeping them to understand the information and be able to properly convey it to others.
Honestly, if you can't handle the Monitor keepers, you won't be able to handle the Monitors. They are the easiest thing to deal with. They won't claw you, sling feces in your face, shoot out of their enclosure leaving you on a mad dash to wrangle them back, tail whip you, or bite you so hard you are brought to your knees. While there are a lot of species that are considered "docile", all Monitors have bad days and will let you know about it. They love to communicate with their handlers, even if that means becoming sick or dying.
In my opinion, OP should do vastly more research before entertaining the idea of keeping any sort of Monitor or Tegu.