There's one point missing here, that is, when we shoot, no matter what the person knows or does not know about the subject it is up to the photographer to show something unique. I have worked with people and horses who have for years been "best-friends." I get joy when they see one of my images and learn something new about their horse or themselves that they did not know . . . If I can do that, i know I HAVE DONE MY JOB. To me the ONLY way to accomplish that is to relax and do your thing never mind the pressure or what's going on around you, you have to bring yourself to the image. . . Obviously this applies less if youre shooting documentary or with strict standards or rules, but if given the license to do your thing, JUST DO IT!