In actuality it isn't difficult. The difficult part is learning how to do it. It really is as simple as changing the way you think. When you start feeling the anxiety, try and remove the negative thought and replace it with a positive thought instead. This will take time but if you do it enough it will become habit forming and you will burn the bridges that link thoughts to anxiety and you will build new highways that automatically link thoughts to positive outcomes. I struggle with this myself but it has worked a great deal for me. Accepting yourself is key.