My replacement screen came with a spudger like the one shown, but it was pretty mangled by the time I got the back off. I had much better luck with another spudger shaped like a guitar pick.
Yeah, the step to remove the inner plastic protector is missing. It is pretty obvious that it needs to happen, but it would be good to include in the guide.
The ribbon for the screen needs to be pushed in further than the other ribbons, and took a bit of wiggling. FYI for others attempting this!