This reminds of a joke about drawing an owl: you first draw 2 vertical ovals, slightly superimposed, one bigger, one smaller. Then you draw a triangle on the smaller oval. Then you draw the rest of the owl.

Sure, you can't succeed if you don't try. But you also can't succeed if you don't have anything to eat, and for the vast, vast majority of people, trying is likely to make that a real problem.