Having 2 seperate tutorial nights like Observation At Freddy's would take away 1 night of difficulty from the rest of the game, but it would help people learn both mechanics of the game safely.

If the game just had 1 tutorial night, that being night 1, it would be harder to learn everything, but there would be 5 nights of office gameplay and puzzles. Also, one of the character's mechanics is based on a time limit for each night's puzzle, so thay character would obipusly be excluded from the night gameplay tutorial.

It would make more sense for the story to have 1 tutorial night instead of 2 seperate ones just because of how the story goes in the game, but I can think of a way to get around that problem.