Fear is difficult to overcome. You are constantly thinking about what could happen or what will happen, that it doesn't matter the width of a cliff ledge or school corridor; it will always be easier to walk a school corridor. Ask yourself this: Would I rather walk on the edge of a cliff, where I could fall, or along a school corridor, where I could bump into walls? The answer should be simple. A school corridor, no der. Now ask yourself why. I would say, "Well, bumping into a wall is a lot better than falling off a cliff!!"
Because of your fear that you <em>just might</em> fall off the cliff makes it a lot harder to walk along a cliff ledge than a school corridor, no matter the width.
Thinking ahead allowed builders to construct the Empire State Building very quickly. Every day, workers were given instructions that showed what had to be done and where each delivery needed to go. Individual materials were marked to make sure they went to the right place in the building.