Criterion 01
First decide which kind of course you actually need
At least four different things are sold as a “lash lift course”: a one-day taster, a professional entry course that lets you start taking clients, an advanced correction course for fixing failed work, and an instructor course that lets you enrol students of your own. Hours, price and what you can do afterwards differ enormously, and most enrolment pages do not volunteer which one they are. Settle this first or nothing else you compare will mean anything.
Ask this
After this course, can I take paying clients? Can I teach others?
Check it on this siteEducation