Myth #1 : "If I can do it you can do it!"
Reality: What one person, possessing specific traits and capabilities can do/achieve under specific to that person circumstance is not related to the ability of another person to achieve the same result. Unrelated! Sorry!
Why this myth is an easy sell?: It's the nature of human psyche to look for Certainty and Control, and it would rather take an illusion of CC in the form of myth, rather than accepting the uncertain reality.