I had it done yesterday and it was not painful or scary or anything. I don't know if everyone does it the same but I had to be on my belly with the gown open in the back and my Doc said they usually test for 58 things but he did 69 on me. They just used these little plastic things to make little scratches on my back after labeling the areas. I didn't feel anything at all. Then I had to lay there for 15 min. During that time it started itching a little. Doc check it and said that I am allergic to 60 of the 69 things they tested for. Nurse came in washed the writing off and applied hydrocortisone cream and that was it. Believe me the hardest part was staying awake during the 15 min. wait .