I am firm believer in gambling being more than just a luck game, to be truly successful you have to master the whole mental game behind it.
Positive thinking is a no.1 priority in gambling.
Affecting your edge in a multidude of different ways, such as your confidence,
which in turn will affect your play and make you perform not as good.
I believe all guides will talk about this.
For more info, check out my gambling guide, to improve your Bitcoin betting -
Bitcoin Gambling 101, you will find all forms of tips to improve your edge in Bitcoin betting. Improving your mental game being one of the ways to improve this.
You are right gambling is not all about luck. Experience, skills tactics and tricks and of course positive thinking are the tools of winning the game. If you use this entire thing affectively and luck also favors you no doubt you will win the bet. Experienced gambler has good hands on gambling and his winning chances increases with positive thinking.