It’s a lot easier if you reconnect the small one while the logic board is still loose, before you start to fasten it back down. You can maneuver the logic board to an angle where the connector slips right in.

Peel up the thin foam tape attached to the very top of the LCD. Under it is a small strip of tape holding the top edge of the LCD down. You won’t be able to remove the LCD without first peeling back this tape. Trying to pry up the LCD without removing it will most likely bend the LCD.