Generate a full detail guide on the practice of 'Radical Acceptance,' a skill from DBT. The guide should be written in a clear and compassionate tone. It must include sections on: 1. What Radical Acceptance is (accepting reality without judgment) and what it is not (it is not approval). 2. How fighting reality creates suffering. 3. A step-by-step exercise for practicing acceptance of a difficult situation. 4. How this practice can lead to peace. Please include a strong disclaimer that this is a therapeutic concept and may require professional guidance.