Generate a full detail guide on how to build psychological resilience. The guide should be hopeful and action-oriented. It must include sections on: 1. What Resilience Is (and that it can be learned). 2. The Role of Optimism and Cognitive Reframing. 3. The Importance of a Strong Social Support Network. 4. Practical Exercises for Developing a 'Growth Mindset.' Please include a disclaimer that building resilience is a long-term process.