Willpower, willpower, is an end point, like the result of a sports workout. It's not a matter of pushing a button, like on television, to make another you pop out, pulled together and ready for the applause of others. It's a conscientious workout that must be done with conscious application, but it's also something new that you'll be excited about because of the progress you'll experience. Perhaps you will even go beyond your own hopes, because the limits in this field can only be set by the individual himself.
There are certainly no miracles, but becoming aware of psychological gears that you ignored leads to a new way of seeing and actions will change accordingly: this is how this blessed willpower that seemed so mysterious and ... difficult, comes to the surface all by itself.