Be very, VERY careful when inserting the pick or whatever you're using. That OLED panel is super fragile. When I was replacing the battery, I damaged my screen and had to replace it, as well. The new screen worked, thankfully. I tried to be very careful but somehow still damaged the screen. I couldn't detect any damage to the screen except there was a very small fleck of the iridescent material. That's the only thing I could tell.

FYI: The phone would boot up into SOME kind of mode. I could feel it vibrate when I held down the power button or used the fingerprint sensor. If you're in that position, it's a good chance a new screen will get your phone up and running. At least, that was the case for me.

You definitely DO NOT want to insert the opening pick any further than 1mm. Measure 1mm on the pick and mark it. Put some sort of clamp if you have to to prevent going any deeper than that 1mm.