I strongly recommend using a Small Suction Cup (IF145-019-1) instead of a plastic opening tool.
After half an hour of various heating times, trying to use a plastic opening tool, I overheated the LCD, which caused it to discolour. Now I need to buy a new screen. I wish I'd thought to use a suction cup earlier; it seems so obvious in retrospect.
I strongly recommend using a Small Suction Cup (IF145-019-1) instead of a plastic opening tool.
After half an hour of various heating times, trying to use a plastic opening tool, I overheated the LCD, which caused it to discolour. Now I need to buy a new screen. I wish I'd thought to use a suction cup earlier; it seems so obvious in retrospect.