However, even after the mental barrier is removed - Majority of us do not have the motivation to actualize our visions even after we know and believe that they are feasible.
I suspect that it takes a special human emotional/energy makeup to overcome enormous obstacles in pursuit of actualizing a vision. Thats what makes entrepreneurs/hustlers special.
Much of the time the decision not to pursue the vision is the right one, because so much sacrifice is required. A lot of successful entrepreneurs have tragic personal lives because in the pursuit of their vision they sacrifice their families. For those of us who are perhaps older, with a lot of personal commitments, and perhaps are also economically comfortable, those sacrifices are too great.
It just comes down to being able to give it a try, mainly from having a combination of low failure cost and high success probability.