I don't usually have a problem putting screen protectors on my devices, I've done it so many times now that it's easy for me. It was difficult to apply the protective film, but try to make sure there are no air bubbles. After playing with it for a few minutes, I decided to leave it with air bubbles and use my finger to push them out instead. This method seemed to work the best and it ended up looking good with no air bubbles.
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