So I'm installing Qubes for a customer. I'm not usually one to complain about things, but I'll make an exception. Perhaps even to their mailing list:
Qubes installer is the least intuitive ever. It finishes, then a little button appears to click "next" but it's hidden in plain sight, and nothing changes on the screen to highly and visibly demonstrate to go next.
Same for configuration in general. I think it's still doing something so I leave it, but it finished ~30 minutes ago.
Bad UI design.