If they can be Mentally ready and if they can established that inside them before taking their steps inside gambling, then it's good for them as they can prevent getting emotions, though it's really tough job to established and practice this kind of prepareness, but there are some wise and experienced gamblers who can deal with it and manage to take the advantage.
It's something really hard deal with as emotions mostly conquer you and manipulates your decision making when you unable to take care of it the right way.
As we know that established a stable emotion is not easy, we must keep trying to do that so we don't gets the effect from playing gambling. When we emotional, that will makes us forget about our rule and that can impact to lose control that we have. Besides that, having self control will be useful for us not just when we playing gambling but that will helps us in other things. We can be wise to act and can considering with other thing before we decide.
Dealing with emotion is not easy so we must practice that so we can control ourselves and know how to act in the current situation. When we lose our money in gambling, we will not become emotional because we know that losing our money in gambling is the risks of playing gambling. We will be wise treating our money and will not lets us spend much money to playing gambling because we only want to have fun in gambling.