Your correct. I probably should not have posted after screwing up a nice 4G LTE screen at the very end of an hour plus of fiddling. Anyway as you say doing it by hand is (just barely) possible but its too time intensive for me *I'm running a microbiz.
I dug around some more and found a you tube video titled "How to separate the screen from glass using SM-252 separator" In short its an adjustable hotplate so you can insure you don't cook the lcd. Then you use a Molybdenum Wire (Like a garrot) to slice the glass (Or Digitizer) off in one clean cut. To get all the glop (glue) off the Display you can use a chemical called LOCA or LPA and an ordinary toothbrush. They have a glue to rebond the LCD to the Glass (or Digitizer) *Note you need a Ultra Violet light sounce to cure the glue. They sell UV flashlights on Ebay and probably a number of other places.