It really is hard, and I am talking from experience. There is nothing heroic or brave about people who like to pretend otherwise. If you do not want to lose a large amount of money when out-of-control-gambling then you need to set up rules for yourself before you even decide to enter the casino in the first place.
Setting up rules is just easy to say but the question there is, can you abid by it? Gambling addiction is not just something you wake up in the morning and just use words or setting rules that you'd use to end it. I feel it takes time to erase it off your body, is best to avoid things that are associated with it, not easy too but a trial can help.
Discipline is the key.
I believe that as long as you keep yourself disciplined to following your own rules then that alone should ensure you do not gamble emotionally or irrationally. If you cannot keep yourself in check, mentally, then you should not be gambling in the first place.
Discipline is one key factor that helps in keeping one in check.
There's this friend of mine in my country that where I used to work back then, he vowed not to gamble again and at some point I almost believed what he said. For about 3 weeks he was nowhere near the gambling shop where I work, only for me to see him the 4th week where he was staking games and I asked him what's happening, he said he's not gambling that this one is for the urge 😅. Like WTF is happening.
So is really hard to say something and mean it.