I think one of the most important virtues of a software professional is being fearless. Someone can lack fear for many reasons:
1) They’re naive
2) They’re stupid
3) They’re experienced
A naive or stupid person is either naturally or consciously ignorant of the risk involved with the activity they’re about to embark on. The first can be forgiven until becomes a trend (in which case they’re starting to become the second).
Test until fear turns to boredom.
Taken up a level, it means do the little things that help you become fearless. Don’t just act without fear.