No issues with scratching the sides. Don`t worry it is just plastic and not that hard like the Belkin Machines they use in the Apple Stores.
I just installed mine. I've done over a dozen screen protector installs in my life, and this had to have been the easiest so far. Usually it takes me at least 30 mins because of all the re-lifting for re-alignment or dust particles. Sometimes I would destroy the screen protector because the adhesive was gone. This took me about 5 seconds using the install guide and looks absolutely perfect.
I installed this in my bathroom, running the shower hot, letting the steam settle so there was very minimal dust flowing. I put the install guide on, hit it with the air can and dust stickers a couple of times and dropped the glass protector on, starting it from the top first, then dropping it when I saw the earpiece alignment was good.
I was worried about bubbles that you mentioned, and having to apply a lot pressure to remove it, but mine went on with nearly no issues. There were some very small line bubbles, but it dissipated with a small bit of pressure. I'm glad I didn't have any issues that other reviewers on Amazon faced, and didn't require re-lifting the screen protector. It was all good in one shot. The Sapphire is very subtle against the black screen and a lot less intrusive and distracting then I originally thought.
It's also very close to the edge, which is what I want. Now I don't have to worry about scratching it when I'm cleaning the screen like I would a normal screen protector. I can barely even tell there is a screen protector on my phone. It just fits so seamlessly.
Thanks Cruncher for your previous assistance!