Generate a full detail guide on how learning new skills impacts happiness. The guide should be motivating and practical. It must include sections on: 1. The neuroscience of how learning creates new pathways in the brain. 2. How learning builds self-efficacy and confidence. 3. A step-by-step guide to choosing and starting a new skill without feeling overwhelmed. 4. How to embrace the 'beginner's mindset' and enjoy the process over the outcome. Please include a supportive disclaimer.