It doesn't take all that much courage to change your life. I don't care if we're talking about working out religiously, changing jobs, getting out of a bad relationship, or moving to a different town. Believe me, you can't lose.
It's like the Chinese allergory of the man caught in the rapids. He's managed to grab hold of a rock, but the raging waters are beating him against the rock over and over again. If he doesn't let go, he'll soon die, but he's afraid to let go because he doesn't know what dangers lie downstream.... let go of the rock.