If you have not already purchased, and are on a budget, I would strongly recommend you look into the "recycled license" market for MS-Office on eBay. Due to recent changes in the law in the EU Microsoft can no longer tie a license to a single machine permanently. They can (and do) issue licenses for single machine use, but they used to be able to tie that license to the piece of hardware on which it was installed and only on which it was installed. Now, if the hardware is decomissioned, it is legal to extract the license and use it elsewhere.
I have upgraded six machines to Office 2016 Pro Plus using recycled licenses and the "biggest difficulty" I had is that some would not activate via the internet and I needed to use the phone activation system. Given that each license was under $10 it was well worth the effort.
I did not uninstall Office 2010 on a number of those machines, wanting to be certain that Office 2016 would function as expected before doing so. I still have both on four of those six machines.
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1809, Build 17763
Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts. Broad, wholesome, charitable views of men and things cannot be acquired by vegetating in one little corner of the earth all one's lifetime.
~ Mark Twain