Gambling is very risky and there is no safe method. so if you want to play a gamble you have to take risks
Exactly, therefore we need to do it for fun only if we do not want to lose more money, once you enter into gambling you must consider your self a loser in terms on money and you will only be a winner once you enjoy what you are doing by having fun.
if you do not want to lose money, you can play with free bitcoin, and play to have fun the better. but you must keep control yourself.
If you are playing a free bitcoin then there is no need to control yourself because there is not risk involve here, you can play how long you want but the reality is gambling without money involves is so boring.