The best way to go out there and "just do it" is to study the biography of someone who has "just done it." This book aims to make it easy for you by presenting a handful of proven leadership principles, and the famous men and women who've come to embody them.
Within the biographies of great leaders, you can see that constant failures always seem to precede great feats -- and you can discover and learn what it takes to get through the dark moments.
All of us have had to deal with self-doubt at one time or another. Biographies reveal not only that the past greats had them, but also how they were able to navigate in spite of them.
Armed with this keen understanding that great leaders weren't flawless super humans from outer space, it is more likely that you can become a great leader yourself.