Be Confident but Not Egotistical
Poker requires confidence, especially when there is a significant amount of money at stake. Before you hit the table, you must believe that you can win. If you don’t, then refrain from playing because you will lose to someone who believes she or he can win.
On the other hand, don’t let your confidence get the best of you. Ego and arrogance are weaknesses that are easy to detect and to exploit. The minute your opponents realize you have an ego issue, you have handed them everything they need to manipulate you. Fortunately for you, the opposite is true. If you are playing an arrogant player, bait them into doing exactly what you want. Also, assume they are bluffing. Overconfident players do that a lot more.