How to Detach Yourself From Worries That Really Cloud Your Mind Regarding Investing

I think investing is a lonely business so people say what advice I got after 1998 when this from the Chennai group is just because your stock is not doing well or you're doing badly it doesn't mean you have to worry. Don't worry over worry on outcome more focus on process and in the long run if your process is good outcome is guaranteed in this business barring bad luck. What's the single worst piece of advice you ever got in the initial days? The advice was that you should know everything about a company for making money in that company.