Generate a full detail guide on preventing burnout. The guide should be validating and strategic. It must include sections on: 1. The Early Warning Signs of Burnout. 2. The Difference Between Stress and Burnout. 3. Proactive Strategies for Setting Boundaries at Work. 4. The Critical Role of Detachment and Rest in Prevention. Please include a disclaimer that burnout is a serious condition and may require professional intervention and leave from work.