He said: "Don't do anything unless you are as happy as a child feeding a duck."
I had a judge telll me one time that his best advice in life was "When in doubt, don't."
Of course he was widely considered in the community to be neither a great judge nor having a lot of personal insight
The problem is that we sometimes have to take risks knowing that our decisions may backfire on us. Figuring out how to do that prudently in itself would be a great topic -- "how to evaluate risk" -- because I don't think Epicurus would or did recommend avoiding all risk. That's another way of framing the question that is often asked as "Should we pursue ONLY the natural and necessary desires?"