"The degree of our preparation will equal the extent of our obedience, which will determine the measure of our peace of mind"

Think about that statement.  If you are confident because you are prepared then you are ready to go out and do battle, or just live!  Your preparation for events as well as past experiences will help to give you peace of mind.  It sounds really simple but I have found it to be true over and over again.  So do your best to be prepared.  Like you always hear, "No plan is a plan to fail."