Very helpful guide, so happy to have a non-cracked screen again!
You also have to remove the rubber cover for these ports, or you won’t be able to do the next step. Pull gently directly away from the camera body until the strap comes out. Re-insertion is as simple - push gently, or guide with a small flat-head screwdriver
For my camera, the two bottom screws were 3mm, the upper left is 4 or 5mm, and the upper right (behind the label) is much larger.
No problem, and they’re unambiguous