Even the adaptation to become a coach of a team is very important. But it is too fast for Pirlo to train a team as big as Juventus, he should first familiarize himself with the lower Serie A teams or Serie B teams.
I believe he will become a good coach.
But as you say, he first had to have some experience with a smaller team. He practically finished the course and soon went to Juventus.
Juventus have signed, not because he is a good coach, but because he was a historic player for the club. At this time, they simply trusted the names they had, not the quality. And then, in order not to admit the mistakes made by the coach, still accuse the best player of the team, as he was not working well.
Unfortunately, this time they did everything wrong...
Pirlo will need to work super hard to become a great coach and I think he should start again from a low-tier team.