Does Les say he is right and everyone else is wrong?
No. The teacher explicitly states he does not claim to have all the answers and does not claim that he is right and everybody else is wrong. He trusts the Holy Spirit has kept him from error, but he avoids asserting exclusive correctness over others.
Les explains that he never minds being asked about his doctrinal position and will gladly write or speak what he believes and why. He says he trusts the Holy Spirit has kept him from error, but he does not claim to have all the answers or that he is right and everybody else is wrong. He contrasts his approach with confusion, saying Scripture unfolds chronologically and is clearly laid out, not a mishmash, and that many people get a new lease on Scripture when they see it that way.