The most important thing you should have in gambling game is controlling yourself. Nothing else. By controlling yourself, you will be able to know when it's time to quit, how much money you can use in the bets and else. Controlling yourself will not easy to do because you need to have a strong mind to be able to stop in anytime.
If you are a gamblers you have a self control, if you dont apply it on yourself then you become an addicted, then you can avoid also to lose. Before you gamble make sure that you always a presence of minds if what is best that will you do, and think that a gamble is not to earn money its just only for relax and for pastimes if you feel boredom.