Gambling should always be treated with a cool head. Emotions are superfluous here. If you show unnecessary emotions, you will lose. There is no place for impulsive people in serious gambling, everything must be calculated.
Aside from that, it isn't bad to have a plan for every gambling session. It is one way of gambling responsibly. Planning the time allocation, money to spend on bankroll, and keeping a tab of the time is one of the things we must consider in playing a Casino game.
As someone who has a fixed amount to gamble every Saturday, I can attest to this. I don't really care that much in winning or losing, but it would be nice to win for a few times since it extends my playtime in the casino. I constantly lose $100 in a month due to gambling, nothing more. It's a somewhat costly hobby but better than any other activities out there that will make me spend thousands upon thousands just to get what I want from it. Never had problems with my attitude towards gambling either. Never looked forward to playing it on weekends, too, but since it's an activity that cannot be replaced in the mean time, I'll still do it and play for fun and not for the profits.