Personally, I think that the right psycology is paramount if you are going to make it to be a good trader. We all know that the knowledge base and the tools are required to help you make the "best" buy and sell decisions. However, if the psyche is not in tune, then decisions will inevitably get tarnished by emotions and other outside influences.
If you want to be the best, do what the best do, I can assure you that they don't follow the crowd and they will only buy and sell based on their own psycology. eg. put on a trade, let the market prove the trade right, otherwise get out!
If person A has a strong technical knowledge base and a weak psycological profile for trading, and person B bas a much weaker technical knowledge base with an excellent trading psycology, who would you back to stay in the game the longest.
I know where my money is.
Enjoy your trading.