Thermolysis will disabled hair follicles permanently, just as blend will disable hair follicle permanently, so fear not.
How do you know that anyone that provides a service to you is doing a good job?
If I were choosing someone, I would let my instincts follow all the research I did BEFORE seeing someone. I would rely heavily on word or mouth and see if I could talk to someone months or years after they have finished electrolysis, with a certain practitioner.
Lastly, you have to have trust, backed up by your good instincts / common sense and research. I know I have trust in my family doctor and dentist, but Im still thinking for myself. We electrologists are all different. Check out the local talent, ask questions, but don't try to micro-manage, observe, make sure the hair isn't being tweezed. You should expect some temporary skin reaction, but you shouldn't look like a pizza face for weeks, as far as your healing goes.
Dee Fahey RN CT LLC
Licensed by the State Medical Board of Ohio for Cosmetic Therapy/Electrolysis and the State Nursing Board of Ohio