Don't be embarrassed. I took my 2020 AT4 to my local dealership and they took almost 5 hours. They mention it was the first cover for a Carbon pro bed. I used some of my GMC rewards which gave me a very good price (40.00 installation).
I just purchased a 2020 Sierra AT4 Carbon Pro. Everything is great. I just cant figure out how to turn on the HUD. The only way I get.is is if I go to configuration but as soon as Inexit, the HUD goes away from the windshield.