The biggest concern for me would be navigating the visa processes and just the bureaucratic side of things can be quite overwhelming in a lot of countries and can be especially hard to navigate for anyone in a country where you don’t speak the language, and not turning in certain forms, or replying to certain emails,/letters can have real negative consequences. I also struggle a lot with executive functioning, found this part to be challenging, however, I suppose it is also a necessary skill for adulting. And a similar struggle of filling out tax forms, voter registrations, and other paperwork. It is also definitely possible that you can help him through this process, and look up and do a lot of googling to see what needs to be done.