What is the part of your job that people would be surprised is most of your job?
Nothing comes to my desk that is perfectly solvable. … Otherwise, someone else would have solved it. So you wind up dealing with probabilities. Any given decision you make you'll wind up with a 30 to 40 percent chance that it isn't going to work. You have to own that and feel comfortable with the way you made the decision. You can't be paralyzed by the fact that it might not work out.
Michael Lewis, Vanity Fair, October 2012 issue, 11 September 2012 source ↗