As for the subject of losing while gambling, one thing AP's and disciplined non-AP's need is TOLERANCE to absorb, accept, and work through losses.
Heck, we're not all douchedawgs or Evenbobs who win almost all the time: we're REAL gamblin' men.
Seems to me it takes two things, primarily: first, adequate bankroll: never play scared, and second, the ability to "let things go," to not get too overwrought when the sword of Damocles descends upon you.