From my experience with phones and iPads: Apply the screen protector after having taken a shower in a bathroom. The humidity helps in keeping free-floating particles in check.
Wipe the screen carefully with a dry microfibre cloth after cleaning it from any grease and dust with a wet microfibre cloth.
Use a piece of cello to remove specks of dust from the inside of the screen protector and the screen if you notice any.
Use a plastic spatula to attach the screen protector. Swipe left to right while going from top to bottom.
I have a protector like that on my iPad because it helps dispersing the light that shines on the screen on occasion. That being said: It's a bit of mess that you would have to do this on an eink screen. It simply should not scratch at all from intended use. Consider returning the device to express your sentiment.
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