Working as an assessor for ISO/IEC 17025

To become an assessor for an accreditation body would involve firstly having the appropriate knowledge of ISO 17025 and secondly the experience and skills to audit ISO 170025 aboratories.  As a lead assessor you would focus on the management requirements, however as a technical assessor you would audit in your area of technical expertise. I suggest you contact your accreditation body as they will have a recruitment and training requirement.  

For more general information regarding ISO 17025 auditing see the article ISO 17025 technical internal audit: The basics at https://advisera.com/17025academy/blog/2020/11/10/iso-17025-technical-internal-audit-the-basics/ and the white paper How to perform an internal audit using ISO 19011 at https://info.advisera.com/free-download/how-to-perform-an-internal-audit-using-iso-19011
Also see some further information at the expert questions, which may be of value,
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• ISO 17025 Lead Auditor Certification at https://community.advisera.com/topic/iso-17025-lead-auditor-certification/
• ISO 17025 Auditing at https://community.advisera.com/topic/iso-17025-auditing/ that mentions our ISO 9001 Internal Auditor Course (https://advisera.com/training/iso-9001-internal-auditor-course/ modules 5 to 8 that provide the details, also applicable to ISO 17025.