Fear is low vibration and excitement is high vibration. Failure is low vibration and success is high vibration. Like vibrations attract, unlike ones repel. When you fear failure, you attract it towards you. When you fear success, you push it away. When you are excited about what you do, you become more likely to succeed and less likely to fail. The difference between fear and excitement is joy.
Can You Manifest Height
You claim that "positive thoughts always resulting in positive things" is not the basis of the LOA. In part you are correct. The foundational basis in science, as I alluded to in the article was that thought stuff particles travel through ether (not air) and interact with formless stuff to create whatever it is that you are thinking about. This was how "the law" started.