The transition was super easy and pretty quick. Even for someone like me, who's bricked a phone before while flashing it. You can follow this video here. It's eight months old, but everything still works exactly the same.
https://www.youtube.com/watch?v=Zo9qHqTDcgM
You can't do it with just any phone though. I just grabbed a new phone and jumped in blind. These are the phones that are supported right now: