Think doubt and fail. Think victory and succeed.
Hesitation only enlarges, magnifies the fear. Take action promptly. Be decisive.
Believe triggers the power to do.
Believe it can be done. When you really believe something can be done, your mind will find the ways to do it.
Build castles, don't dig graves.
Luck take a second look at what appears to be someone's good luck. You'll find not luck but preparation, planning, and success-producing thinking.