When I heard Skype was ending I decided to get an iPhone from a real carrier (my impression is that MVNO service sucks, I used to have Tracfones that didn’t work reliably either in Upstate or NYC.). At the AT&T store the salesperson had never transferred a phone number over from Skype but looked up in a manual about how to do it. She said it was the easiest number porting she’d ever done.
So if you want to port your Skype number, just do it!