I think you need to look at the patient and decide on the basis of how much reduction is needed on the teeth and the fear and sensitivity of the patient who is having the procedure done. It seems to me that you are already concerned about the pain. We use an anesthetic on most patients but we have used oral sedation when there are a number of veneers being done. Halcion works well and the patient is relaxed and so is the dentist!
You have a choice of lumineers or vivaneers where there is less reduction but you also have to have the right size teeth so when done, the finished product does not look bulky. Dentistry should not HURT! Pain should not be an issue...that is whey we have oral sedation.