I have never found a screen protector be it glass or film so easy to fit.
I didn't bother with cleaning/dusting the screen as I was fitting to a OnePlus 7 Pro which still had the factory applied soft screen protector in place.
I simply removed the factory applied protector and immediately fitted the Orzly glass protector.
I say fitted but in all honesty the screen protector just fell on, no air bubbles and no need for any squeegeeing, Just a quick smooth around the edges to check and job done. I think the fact that the protectors are profiled probably helps with the ease of fitting
I was a little dubious about the black edges but once the screen protector is on the phone they're barely noticeable.
I have tried three different cases, the one supplied with the phone, a Spigen Rugged Armour and a generic flip wallet. The screen protector works with all of them, no edge lifting whatsoever.
I chose the Orzly protectors because they are actually profiled to follow the curves of the phones screen and having fitted one I cannot see how the flat protectors with rounded edges can work anywhere near as well.
They may cost a little more but as far as I'm concerned are well worth the money.