I've been playing with Threads for a while now, and am almost ready to test import my Classic board.
I've been dreading this part the most, as I have a lot of posts.

Just to confirm, when I start the import process, my Classic board can stay open to users and run fine with no problems?
I just don't want anything I do to effect my live Classic board.
Is it correct to say that the only real concern is that when I want to go live with the imported board, I should consider closing my Classic board, so that I don't lose any new posts users made during the import process?
Also, I'm a little confused about the re-direct scripts I've read briefly about. When/how do those come into play when I'm ready to go live with Threads?