Quote from thereikid:
Work on controlling emotional reaction. Walk through the thing you fear in your mind and take action being detached from the result by sticking to a good trading system.
I hear people bashing sim trading alot, the "It's not real money so it's not the same" argument. But it is an excellent way to train oneself to execute their plan on a repetitive basis, similar to building muscle memory in sports.
Think about how many golf balls Tiger Woods has hit in practice over his lifetime, or how many pitches Roger Clemens threw outside the real games. Or how many elbows Ron Artest ("Metta World Peace", really?) threw on the neighborhood b-ball court.
Wen I find myself failing to execute properly, I go back to the simulator and work on straightening out my slice. Practicing with real money gets expensive...learned that the hard way.

