Like ICA, I'm sure there are many things that are not shown to us that make his "missions" work. I'm hard pressed to believe that he would be able to complete many of his tasks otherwise, given both the time restraints, and the amount of and quality of people he's given to work with on camera. With that being said, I do enjoy watching his show. But the realisticness, especially with what the viewer is shown, is highly improbable.
"Boldness has genius, power, and magic in it."
Johann Wolfgang Von Goethe