How do you become a Lead Auditor? To become a certified lead auditor, one should have to complete the lead auditing certification and two years of work experience as an auditor in any certification awarding bodies or need to conduct second/third-party auditing for any organization. Green World Group, UAE – the premier Health and Safety Training Institute offers intensive training for the ISO 45001:2018 Leading Auditor Training via Live Online sessions that enables learners with both theoretical and practical knowledge in occupational health and safety management.