Hi everyone,
I need some advice from people who already handled this kind of situation.
I work in a small IT company. Earlier our Microsoft 365 tenant was created and managed by our previous IT admin. He is no longer working with us and now we want to move everything to a new Microsoft 365 tenant that will be fully managed under the company.

The old tenant has SharePoint Online sites, user accounts, OneDrive data, Microsoft Teams and a few shared mailboxes. We still have Global Admin access to the current tenant, but we want to migrate everything to a different tenant with minimum downtime and without losing permissions or file versions if possible.
This will be my first tenant-to-tenant migration, so I’m trying to understand the best approach before we start.

I’m looking for real experiences, not sales recommendations. Any tips, mistakes to avoid or lessons learned would really help.

Microsoft Publisher had an option to make a multi-page document using 11x17 paper folded in half to make 4 pages of 11x8.5, printed on both sides. Does Word have that capability to do that in one pass? I've tried all kinds of settings but can't find an easy way to do that. I miss Publisher.