In tight places like this, I found a teense bit of Elmers spotted on the screw head and allowed to dry a few secs to the driver, helps to stabilize the way in.
When removing the logic board, a slight push towards the top of the phone, will "unclip" the bottom edge of the logic board near the "Do Not Remove" screw.
When reinserting the logic board, there is a tab in the top edge of the rear shell case that the edge of the logic board goes under. It is the edge closest to the camera.
Without this "comfortable" fit, you won't be able to get the SIM in.
The camera itself also has an element of "comfortable" Fit.