Having strategy can not always make us wins in the bet because we must consider that the match will not always run as we want. We need to prepares if our analysis is wrong because the match change and we need to have discipline to keep in the right track. But yes, we must be careful with our emotion because that can also change easily based on the situation that we have. If we can have a good discipline, we can avoids the thing that can make us in trouble. So with discipline, you will follow your plan and will not trying doing something that can cause you in trouble.
Discipline is something we always talk about, even we all agree that it is a very important thing that must be applied in life, not just in one aspect. Talking about discipline, it is a very easy thing, but it will be very different when we apply it, because it is very difficult to do. We must hold the commitment very tightly to be able to carry out discipline very well, because I see people can only be disciplined at the beginning, after that they commit violations about something that they have actually planned at the beginning. Consistency in implementing discipline is a complicated thing, because sometimes there are so many temptations that will come.
Practising discipline as a gambler is not hard at all, though I agree with you that it's easier said than done, but the honest truth is that, anyone can practise discipline in gambling easily and very effectively, the only important thing is for the gambler to ensure that he or she is very conscious about his plans, targets and ensure that he or she stick that in his subconscious mind as a way not to forget.
I can tell you that one problem many people have with discipline is forgetfulness, and not temptation, it's like someone going to a casino and has $200 in his pocket, and he concluded in his mind that he will spend past $100, that as soon as his spending is nearing $100, he would quit, so that he can return home with the remaining balance, but upon arriving at the casino and meeting and greeting few friends, they sit to play some game, the game becomes very exciting and he completely forgets what he initial told himself he would do, and this is because he allowed himself to be carried away.
A person who practise discipline and don't want to fail must be alert in the mind at all times, this will help the person not to forget what he as said he will do.