Re: Microsoft support will get buried tonight...
I did two computers on the 28th, both went through perfectly.
Neither of them were using the hard drives that the computers normally run with. After doing the trial run, I backed up the first hard drive to vhdx and am now wiping the disk to do a fresh install.
Which will make 7 machines upgraded, some of which haven't had oem driver or bios updates in years.
Google and perfectupdater (trial) is good enough to get anything working well.
Or you could pretend that Linux has a good out of the box experience and use that.