There is a lot of talk about discipline but you have to have a clear idea of when you are going to play what you should do in any case where you could lose control, you have to have a backup plan in case your money runs out or you spend more than normal, it is Advisable to have control of how much time and how much money you have to spend, that is the first basis for having good discipline in the game, losing large sums of money is what you should avoid.
Large sums of money should be at your own discretion of what amount of money will account to that being large enough to not want to lose in gambling. Having a clear projection, a proper risk management plan will not make you fail or lose interest even when you meet with a loss. You should always bet in such a manner that when you lose, you’ll have the passion to come back another day and not feel pained for too long of losing because it was actually what you could afford to lose you wagered.