To anyone that’s absolutely stuck: there is a little slot along the drive where the screwdriver fits in. I didn’t know this for at least 3 times I took apart this computer, and finding this now has helped me sooooo much.
Two of the hex screws here got stripped. Please, replace them ASAP and I would recommend not putting them back just to not risk making them stuck. I spent 30 minutes trying to get those two out.