Everybody has a different level of pain tolerance but most clients are completely comfortable and relaxed during the appointment. You may feel slight discomfort but the results will far outweigh this.  You may take TYLENOL prior to the appointment but NOT ASPRIN.  A highly effective numbing solution is applied before and during the treatment to keep you feeling as comfortable as possible.  Clients have compared the sensation to tweezing or threading your eyebrows.  (I have even had a few clients fall asleep during the procedure)