A trader can be likened a fisherman and The market can be likened the sea. We can not control the sea, but we can direct our ship. You don't need defeat the market but your self. So you need psychology trading.
You need psychology in trading because you have to have an inkling of how the buyers or sellers will act when a price is hit. You need to have a certain method or plan and stick to it because you believe that by holding on to it and getting your emotions intact and its not getting in the way of your trading, you will be rewarded or have a profit in the end. If the movement is not on your side then you just have to stay firm with your decision/strategy because you know that you cannot control the market but you can control yourself which is a big factor in trading not deciding immediately because the situation is not in favor with you.
