Cross Forest Migration Help

Hello, I'm a Windows Admin of about 13 year and I landed a contract position with a small company that wants to do a Cross Forest Domain Migration. The long and short of it is this: Parent company X sold one of its child companies to Parent company Y. The child company is currently a site within company X's domain. Company X wants them off their domain before the end of the year. Sum total experts enlisted to accomplish this? Me and a self-taught systems admin who was already working here.

So obviously, I'm doing my utmost to learn their environment ASAP. Here's the route I'd like to go: The child company used to be it's own forest and it's own domain. I'd like to migrate them back to that first. We can establish inter-forest trusts with the parent companies as needed, then I won't be quite so rushed to move them into Company Y's domain before the end of the year. I can take my time, do it right, etc. I'm looking at about 30 people, 10 servers ranging from Windows 2003 R2 (upgrade before migration) to Windows 2012 R2, some rather large SQL databases, a hybrid Exchange 2013/365 email setup and a single cabinet full of servers and gear. It's not a ton of stuff to move. Doesn't mean it doesn't break via migration. Hence the phased approach.

Things I could really use at as reasonable a price as possible:
1.) I can't seem to find a current download of ADMT. Did Microsoft rename the thing? Are there some unpleasant surprises for me going down that rabbit hole? Is there a better tool for the job?
2.) I could really use a current and reliable tool for moving O365 email accounts from one tenant to another.
3.) I'm no SQL genius. How much trouble am I in migrating SQL?
4.) A utility for migrating a PC across domains as seamlessly as possible without losing any of it's data. I've used one in the past, but I can't for the life of me remember the name of it.
5.) Absolutely any pertinent advice. I've been a part of a number of migrations, but this is the first time I'm the only SME and I'm feeling a bit overwhelmed tbh.

Thanks in advance for any and all help!

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