When choosing someone to perform the procedure, find out how much experience they have doing it. My first 2 treatments were done by a rookie and the strength of the IPL was very low. My best results were not seen until the person who normally did the procedure took over for the 3rd and 4th sessions. She increased the strength of the pulse and I got much better results.
Sunblock is VERY important! I need to be re-treated because I was exposed to the sun during a cross-country drive and the redness came back.