From mailing list I've subscribed, they explained how to be HSE expert (especially Process Safety Management)
They told that we've to be expert in 19 items following below :
1. Process Safety Leadership and Culture
2. Compliance with Standards, Code, Regulations and Laws
3. Workforce Involvement and Information Sharing
4. Community Outreach and External Sharing of Information
5. Maintenance and Enhancement of Process Safety Competence and Technology
6. Process Safety Information
7. Hazard Identification: Process Hazards Analysis
8. Risk Assessment
9. Training, Competence and Performance Assurance
10. Operating Procedures
11. Mechanical Integrity
12. Safe Work Practices and Control Procedures
13. Management of Change
14. Pre-start Up Safety Review
15. Emergency Response and Crisis Management
16. Contractor Management
17. Incident Reporting and Investigation
18. Performance Measurement, Monitoring and Continuous Improvement
19. Auditing and Management Review

let start learn and learn.... and be focus... :)