"The typical trader lives or dies (emotionally) on the results of the most recent trade. If it was a winner, he`ll gladly go to the next trade; if it wasn`t he`ll start questioning the viability of his edge." - Mark Douglas, in Trading In The Zone
An easy way to fight these deep seated instincts is to have a 20-day rolling dollar performance on your trading. That way, day-to-day fluctuations won`t be felt so strongly.
Have a great day!