Inaction breeds doubt and fear. Action breeds confidence and courage.
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Dale Carnegie

If you are having a bout of fear and doubt, you must take action! The longer you sit around and let your fears and doubts take hold, the more likely you are to let things get blown out of proportion. Take an action, however small it may seem, in the direction of solving the issue or confronting the fear at hand, and you will be amazed how this tends to gather momentum. Before you know it, you will have moved from fear and doubt to confidence and results.