Hmmm, i suspect a few of the regulars here are waiting for you at the ring games...
Confidence is good, knowledge is king. The basics as to statistics, odds
and so on are great tools. Keeping a constant watch over your game is equally good. Discovering those leaks before they turn into massive burning holes in your bank account. Experience is another goodie. Getting used to the fact that American Airlines isnt a surefire win, but merely one hell of a good starting position. And then theres the knowledge that even though you havent seen a decent hand for an hour, you're still alive in the tournament and there is no need to push all-in to prove you're hot stuff.
So confidence as the precursor to poker success. No friggin way. Confidence is ok, but if you play with confidence as your main instrument, some of the dudes and dudettes here will rip your heart out with their teeth at the tables.
One thing more: The money you stick in the pot are not really money, they are tools to win money. As long as they are in play, they are only tools. Doesnt take confidence to use your tools correctly - it takes skill.