In trading that is not the case. If you have capital you can play. That is the lure as well as a pitfall. Something so attractive brings with it all of the psychological baggage that professional traders know all too well. The fear and greed. We are all afraid to lose and at the same time afraid to miss the move.
Unlike in other professions like sports where you specialize in offense or defense, or law where you are a prosecutor or contract specialist in trading people often have no idea what they are or why they are in the trade and simply become swept up by the excitement.
We buy Apple and all of a sudden decide we are an Apple investor. Trading and investing are completely different animals. You have to be able to distance yourself from the affection you feel for any company if you are to be a good trader. There ample opportunities to trade Apple on the long and short side.
So one of the best exercises I can show you in becoming a successful trader is as follows. Next time when you are in a few positions simply shrink the "symbol" column so you cannot see the name of the stock. Don't trade the name, just trade the money. This is one of the best ways to get yourself into the trading zone.