Applying ISO principles in practice

Answer:

I'm not sure what ISO principles do you mean, but I assume your thinking of ISO 9001 principles. New version of the standard has 8 principles instead of 7 in the previous version. The principles are translated into requirements of the standard and by meeting the requirements, you will apply the quality principles.

There is no requirements for expertise regarding the principles, they only need to be applied through compliant with the standard and establishing the Quality Management System. For more information on quality principles, see: Seven Quality Management Principles behind ISO 9001 requirements https://advisera.com/9001academy/blog/2014/02/04/seven-quality-management-principles-behind-iso9001-requirements/