As this is an innate trait, your knowledge of yourself, your actions, and your thoughts can be helpful in determining if you are an HSP
If you relate to the piece titled ‘Experience of an HSP’  or any of my blogs which tell stories about being an HSP such as ‘What Changing Tires Revealed about being a Highly Sensitive Person’, you may be an HSP.
Interested individuals can complete the ‘Coaching Compatibility Questionnaire’; as Karin works with many HSPs, many of the questions relate to being an HSP