Ok , I’ve watched all the videos - seems easy but they usually show partitions .
I’m using a system that doesn’t fix to the wall so you have a top and bottom U track . You can slide the vertical steel stud in and screw the top and bottom . But you can only do that from one side ( other side is against the wall ) . Does this matter ? . Be happier a screw each side .
This doesn’t seem mentioned in any videos so i’m Guessing it’s not an issue ....