The right antenna is kind of P shaped (rotated 90° to the right) with the small end facing the middle. I'd suggest to stop at the middle when loosening the left antenna and to do the same thing coming from the right.
The warning says to not insert it more than 12mm but it should be not more than 5mm. There is a ribbon/display connection at the bottom and i damaged it.
I did a screenshot of this image to always see it while progressing through the steps and did exactly the same mistake. I read every comment in the steps below but yours only now :( On my device it's 5mm from the edge of the screen glass to the ribbon.
