Allow me to recommend...

Richard Stearns was a guy that had the world in his back pocket. He had money, fame, and the whole enchilada. He felt led by God to put his money where his mouth was. He took the position as President of World Vision and got busy making a difference.
Here is what I am guilty of... I encourage others to step out in faith and be the answer, but very rarely is it me who takes the real plunge. I believe I do a fine job of shepherding and proclaiming God's Word in comfortable USA, but not when it is inconvenient to me.
I believe that God is calling me out of my comfort zone. I'm not completely clear as to what He is calling me to do yet, but believe me when I say that I am a bit scared and apprehensive about the whole subject.
I wholeheartedly recommend this book.