You are who you are and what you are because of what has gone into your mind. You can change who you are and what you are by changing what goes into your mind.
The problem is not getting rid of fear, but using it properly.
A positive attitude will have positive results because attitudes are contagious.
To be candid, some people have given positive thinking a bad name. I can't stand to hear some gung-ho individual say that with positive thinking you can just do 'anything.' If you think about that one for a moment, you recognize the absurdity of it.
Do more, give more, try harder, aim higher, and give thanks. The rewards will be yours.
Practice is simply preparation for success.