Controlling risk is one of the most important ingredients of successful
trading. While it is emotionally more appealing to focus on the upside of
trading, every trader should know precisely how much he is willing to lose on
each trade before cutting losses, and how much he is willing to lose in his
account before ceasing trading and re-evaluating.
More detail in
http://www.freewebs.com/whatisforextrading/Forex_trading_controlling_risk.html
It is very simple. You can work it with it and making money with it.
Good luck
Whatis forex team