Build yourself a trading plan that will guide you in the market, and this is actually the most effective way to actively remove the loss transactions due to emotion. 
That's true because most are the problem in trading is not only a losses but also the emotions. If we want really want to trade we need a plan to how we can manage well our assets and also how to hold our emotions. That plan will only be useful if you can effectively do it, provided you have a working plan, if you are not good in managing your emotion, that plan would be useless.