Hopefully it will all go smooth. Given their track record on previous rollouts on the PTS anything and everything is likely to happen which could get us into extended maintenance.
I have the game from Steam and the download worked just fine. They don't have a PTS for console players. I used to play on XBox One and was tired of the limitations it had so I switched to the PC. I found that Skyrim was a Steam game as well as ESO so I got them from Steam.