Generate a full detail guide on the importance of celebrating personal successes. The guide should be encouraging and celebratory. It must include sections on: 1. Why we often downplay our own achievements. 2. The psychological benefit of pausing to acknowledge progress. 3. A guide to creating a 'Success Jar' or 'Brag Document.' 4. A list of ways to celebrate wins, both big and small. Please include a supportive disclaimer.