Trend follower Kevin Bruce once had the opportunity to go to New York and see one of the major brokerage firms’ trading floors. He found it like Battlestar Galactica, with more screens and lights than you could imagine. He decided: “I couldn’t think in this environment.” You can never make decisions when the market is open; everything is like a flight plan, it’s got to be pre-planned. Trying to make decisions when the market is open is going to lead to emotional decisions. Everything must be thought out ahead of time. Know what you are going to do if it goes up, if it goes down, and if it doesn’t do anything. When all that is figured out, you put your system on autopilot. It almost sounds too simple, but that’s the way you need to do it, and that’s why you don’t need to stress out about anybody’s opinion.
More? See: The Little Book of Trading.