The setup is very error prone. I have successfully installed glass screen protectors on several phones in my house, but always with the included installation guide/alignment bezel. Unfortunately, on my first attempt at this article for my new Galaxy Tab S7 11, I did it with my bare hands, and as I went through several rounds of space and lifting to achieve better alignment (particularly the camera cutout and edge alignment), mixed Bubbles caused by dust left some dust bubbles and spots in the corners/edges that didn't stick enough to get rid of the bubble or edge defect. So I started over with a second screen after thoroughly cleaning the screen with a cleaning kit (not just the stuff that came with it), but this time wearing surgical gloves. Same problem with alignment and multiple placements. While the gloves reduced the number of gap areas between edge and corner, there were still a few and the alignment was far from perfect. Will be replaced by one with an alignment guide.
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