I'll be mailing the return, not e-filing. If I need to edit after I print (but before I mail), can I edit in TurboTax and reprint, or will I need to do an amended return?

Yes you can. As long as it hasn't been e-filed or mailed you can edit and then reprint.

Yes, if you haven’t efiled or mailed it you can go back in and change or add anything you want.  Then save and print again.  Click on Add a State to let you back into your return. Do not amend.