Fear, fear, fear is what I hear when traders are talking about their psychological problems with trading. Sure, fear is a problem when you have a crappy trade on and whilst it needs to be dealt with appropriately, but it is NOT the underlying problem.
Fear is created in situations of unknown risk. It is our evolutionary mechanism for telling us that there could be big trouble ahead. The way we act subsequent to feeling fear is of course something which needs to be scrutinised as it's clearly all to often in a way which is detrimental to our accounts.
But as a trader I know this. Although there are indeed uncertain situations which markets do throw up from time to time, the vast majority of fear and uncertainty is created by lack of preparation, biased views, inconsistent monitoring of markets and indecision. In other words, YOU BECOME FEARFUL IN A TRADE BECAUSE YOU KNOW YOU'VE MESSED UP AND HAVEN'T A CLUE WHAT IS REALLY GOING ON. Or you just can't help but take impulsive trades where you know you shouldn't. If you don't have rigid enough risk mechanisms in place to exit the trade and the fear builds even more as the market prints against you. This explanation also covers those who are fearful of pulling the trigger to enter a trade. If haven't assessed the market, indentified trades and assigned proper risk parameters to them, there's every reason to be fearful as if you do take a trade, you know you'll be floating in a sea of chaos very quickly.
I hope I'm being clear here. Whilst it's important to manage fear when it appears, it's imperative that you manage day-to-day trading objectives properly and thus evade potentially fearful situations in the first place.