There are a variety of facial peels. Some are very light, others much deeper. It depends on the solution you use and the strength of these solutions. I worked in a cosmetic surgery office and I did many of the peels. When doing the light peels, I was able to assess the patient's skin condition using the Fitzpatrick skin scale and easily determine the type of light peel to do and the length of time to leave the solution on the face. When using the deeper peel solution, I would check with the doctor about the strength and length of time because some of the solutions are very strong and can cause severe burning if not done carefully. You may want to "intern" at a cosmetic surgery office or dermatology practice, just to get background and some experience. You won't be paid, but the experience and knowledge you learn would outweigh what you'd get at a paid training course.