When you try and try and nothing seems to work then try gratitude. Just back off and stop trying. Get a blank sheet of paper and write down everything you are grateful for. Then for several days or weeks just coast and keep thinking gratitude. The answer will come at its own time and of its own accord. Frustration is just another form of fear. Gratitude will make you forget your frustration if you really get into it and let it take over. What are you thankful for?
