Hi CarolynQ
In the case of the gourd banjos, the assembly video is a little out of date on that detail. The slots in the nut and the bridge are all equal in size. There’s no wrong way to orient the nut, but you may need to widen the slots for some of the strings, maybe. So put the nut in place and if you can’t get the strings to easily sit in the slots, you can widen with a folded piece of sandpaper like a file.
Thank you very much for your support and thank you for posting here in the forum!