The notion that we should always and everywhere apportion belief to evidence in such a way that we affirm only that for which we have sufficient evidence ignores the fact that belief for beings like us subserves action. If one acted only on those beliefs for which one had sufficient evidence one would not act as one must to live well.
When a young person believes that he or she can do such-and-such, it is almost always on the basis of insufficient evidence. And yet such belief beyond the evidence is a sine qua non of success. There are two necessary conditions of success in life: one must believe that what one proposes to do is worth doing, and one must believe that one is capable of doing it. In both cases one believes and acts on evidence that could hardly be called sufficient.
This strikes me as a good maxim: Don't let insufficient evidence prevent you from believing what you are better off believing than not believing.
For a detailed discussion of what is behind the above remarks, see The Pragmatic and the Evidential: Is it Ever Rational to Believe Beyond the Evidence?
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