Well, print it out on the JPSS and line the shirt up on the heat press. First off, the image will be reversed left to right (and upside down if you don't pay attention) so if there is writing or the L/R orentation is important, print he image in reverse. second is to pre-press the shirt with the heat press up to temp or almost up to temp for two reasons. It will remove moisture and flatten the shirt. Unless your in the desert, there will be some moisture in the shirt weather it feels like it or not. Even if your in the desert, it would be a good idea to do the pre-press.