I am a self scraper with some gua sha and myofascial tools bought off the internet. i would say that going to a practictioner to scrape you is much better than self scraping. they have more sensitivity to the vibrations caused by tissue as the tool moves across a muscle than i do, as they have more experience with it. they know how much to scrape and when to stop, when they feel the tissue starts to change. i sometimes can feel it and sometimes i cannot (more often not).