EVERYTHING HUMANLY POSSIBLE.
I emphasize this because I was witness to the very results of being positive and confident. Some very good results. Confirmed by the universe I might add. But it is a tough thing to accomplish. Even after being convinced of the power of positive thinking and a confident spirit, I still struggle to stay in such a mood. It does indeed take work.
The key here is to get to a point where you truly believe in yourself and in your power. Even in cases where people may think you're a fool. You've got to say "Fuck Em!" It's not about anyone else's beliefs but your own. This is your life, your situation, your time, your existence, your dreams, your goals. Believe in them.
Believe in yourself. Find a way to be confident. Even in failure. Recognize that your failure is not the end of you. And as long as you still exist, then you still have every opportunity, every possibility to come out on top.
Confidence is believing in yourself. Truly believing in yourself.
You'll have doubts of course. Without doubts you cannot possibly reach the true strength of your belief. You have to go through those troubles in order to fully understand and experience confidence. How else can you truly know the feeling of comfort without experiencing the pain. How can you fully understand calm if you have no reference of what turmoil is.
You will need to do this several times before you reach full confidence. And even after then you'll still experience doubts. But just like a muscle, the more you work it out, the more you damage those fibers, the stronger it re-builds itself to be.
If you need a starting point then just follow this quote from The West Wing. In a scene from the episode titled "In The Shadow Of Two Gunmen" President Bartlet doesn't have alot of Faith in himself, but his friend Leo McGarry does. Leo tells him this:
"Act as if ye have faith and faith shall be given to you. Put it another way, fake it till you make it."