I have read a bit about ISF calibration on this and other forums. There are no certified ISF guys in Charlotte, the nearest is a couple of hours away. My question is, with a direct view TV like mine, is there any necessity to have a professional ISF calibration done to get the best possible picture? Can't I basically calibrate it myself with Avia or Video Essentials? I realize that RPTV's have hardware adjustment issues that benifit from having a pro come in, but do direct view TV's have the same needs? And, since my XBR is a HD-ready set, is there a whole separate calibration that needs to be done for the HD output?