My Kindle Paperwhite (first generation) only has 10 screws rather than 11 as described, i.e. the one in the top middle is missing from the description. So before digging for that extra screw you might want to check whether the midframe lifts out of the case already with the 10 easily accessible screws removed.
I had some trouble first with prying off the bezel using different spudger tools. The Jimmy finally did the trick for me, since it is thin enough to get into the edge around the screen and also flexible enough to cut into the adhesive.