Well, I don't think you can have enough preparation to manage a club like Madrid, where a trophy is expected every season. It's a tough task, but you have to start somewhere to be able to cope with it. Hopefull,y the management and the fans are not that impatient and treat him terribly (if he did join them), especially if he can't get the players that he wanted. There are many examples where a good manager failed to deliver because the environment didn't support them. Of course, there are exceptions like Klopp or Guardiola, where they can shape the environment to what they want instead. I think it's too soon to judge if Xabi dan do the same or not.