Cracked the screen following the instructions. Too bad I didn’t read the user’s comment. Fortunately it can still be used as normal, though on a white screen the cracks are evident. Good luck doing this .
Would like to add one more point. Just completed it today but then the foam tape is no longer sticky enough to hold the screen. I almost broke the screen because of this. So it may be useful to add some double-sided tape on the edges of the case after the operation.