You need that self-discipline to make sure that you will practice whatever you setup before playing, else, you will messed around.
Once excitement is already there, to me, it gives me the thrill and wanting to gamble more. I'm losing my self discipline with that but it knocks me out whenever I start to have a losing streak. It's good on my end that it wakes up whenever I feel that way. Because setting up yourself before you gamble is needed that you'll have your own book and rule to follow. Easy to say sometimes that we can control ourselves but, once you're already on that momentum, I doubt that you'll have that control anymore.
Yeah that driving desire always managed to dominates and even you set up your limits there's still times that you exceed from what you set up for your limitation, though there are experienced gamblers who can overcome the situation, and manage to make a hard stop, while other gamblers will push forward andkeep adding more money to chase for their loses.
It's easy to say just like you mention but when you are already in the situation, its tough to control as the lust and desire inside you already dominated, the next thing that you will notice is you've got empty pocket and it was late to regret whatever decision you made to push forward.