Few things are more important that having confidence and belief in yourself and your abilities. Of course what is sometimes overlooked is all the preparation and hard work that must come before -- otherwise you are dealing with false bravado.
In his book "Go For The Magic," Pat Williams told a great story about hitting great and Hall of Famer Stan Musial.
During Musial's playing days with the St. Louis Cardinals, one of his teammates entered the clubhouse whistling and obviously in a great mood. As he walked past Musial he said, "I feel like I'm getting two hits today. Every feel like that Stan?"
In which Musial replied with a smile, "Every day!"