Op, I'm an electrician. This comment is the best advice. All boxes used for fans need to be fan-rated. This is possible to do without attic access.
I haven't watched the video but this looks to be an okay start: https://youtu.be/DKWeyydoYTI
Just remember that ceiling fans are heavy and the little wiggle over time will cause more wear and tear than you might think.
Best of luck!
If I recall correctly I had to wait a good 90 seconds for anything to pop up after grub when I've installed nobara.
Have you tried waiting a good minute or two?
I'm kinda meh on nobara, the install is cool, performance is great but I've had some weird problems I never had on xubuntu. ๐คทโโ๏ธ