I recently read The Way of the Seal by Mark Divine, a retired Navy Seal. Below the title are the words, "Think Like an Elite Warrior to Lead and Succeed". There's no doubting the success Seal teams have in doing the seemingly impossible. This book explains their way of thinking. The process they take with everything they do. How they train their minds for success before even going on missions. How they train their bodies for success.
I don't want to get to in details of the book as you'll read it if you're interested. I will say that it was one of the more enjoyable self help books I've read as it was well written and the ideas made sense. Part of my enjoyment was definitely because of my fascination with the the Navy Seals.
If you want success in anything, it will require a lot of you. Mark Divine lays out their process. He is very thorough and honest. You finish the book knowing how they are able to have a continued high level of success.
The question always is, "Is my goal worth the effort?"