Being over confident is equal to being blind.
It is ok to be confident, but don't let it turn to arrogance as arrogance is a sin that blinds us and prevents us from seeing God's plan. Better to spend time being humble, grateful, and praising others than thinking of yourself. Open your eyes to the love of putting others before yourself.
For by the grace given to me I say to everyone among you not to think of himself more highly than he ought to think, but to think with sober judgment, each according to the measure of faith that God has assigned.