Bravery is not the absence of fear but overcoming it.
(I'm sorry to start off cliche.)
Bhuddist monks create mandalas. They spend days creating an intricate pattern in colored sand; very meticulous and very present. It's the only thing they do in that time. Then, as practice in accepting the ever changing nature of the universe, they sweep it up.
When we practiced willpower it was important to let go of planning the hows, and concentrate on the fact that you were moving yourself toward something you wanted. Freeing yourself of the hows is a practice in surrender. Concentrating your willpower on the act as opposed to how you could possibly complete the act is a better use of your willpower. I'm not suggesting that you sit around and wish, but that you purposefully direct your decision-making toward achieving whatever it is.
The practice of surrendering to the moment is another way in which we can practice will power, as well as presence. If we are all the way present and not insisting on making our experience fit our expectation we can progress in our lives in a way that may be unexpected but incredibly fulfilling.
Decide to do something well by committing your whole being to meticulously completing whatever it is all the while excepting that you can't keep it when you're done. Experience beauty and joy in transience. Do not fear the end. Because you are a better human being for having committed yourself wholeheartedly. And it can never really be taken away from you completely.
Only you can prevent yourself from experiencing the totality of existence by cowing to fear, by creating walls and defenses. When you're in defense mode all you can think about is the good you used to experience. The present experiences pale in comparison. Don't wallow in the past. What are you afraid of? Really. What do you stand to lose by living wholeheartedly? Ask yourself these questions and quiet yourself until the answers come.