A vehement +1 to this post. Reducing the conceptual size of the problem to something that you can just shrug and do will give you a step forward and knock a chunk out of your anxiety. If you keep at it, the anxiety will reduce over time.

One thing that's helped me is self talk. You should assure yourself that you're the man and that these challenges are easy for you to overcome. Don't be afraid to go over the top with this and when you do it, give yourself a pat on the back before you take the next step.