We all get doubts and that little voice inside our telling us "you can't do that" or "you're not good enough" - in the word of Coaching we call them the Gremlins.
Once the goal is effectively set, and all the visualisation techniques have been used, there is nothing left to do but take action. Crack on!!
If this sounds like you and you have inappropriate fear (or for that matter anger, sadness, hurt or guilt) in your life, then I would recommend googling Time Line Therapy.
What's your strategy for maintaining a positive mindset? What is your strategy for dealing with hurdles and set backs? What's your strategy for keeping momentum up? What's your decision making strategy?
We can reach out to others for a supporting hand or a kick up the backside. For words of encouragement or even sometimes the harsh reality check. Remember though, that responsibility for achieving your goals is always yours, not theirs.