Hi Chris,
You might consider having AC support do the upgrade for you. Up until recently, I did these myself, but it just seems things have gotten more.... complicated...... recently.
I have had uniformly superb dealings with AC support over the last few months. They will prescheduled the time, and do all the work on the main computer. I then upgraded the workstations myself, but I think they would help you with that if necessary.
Otherwise, if something goes wrong, you are then starting from scratch with support.
I had a major server crash in August, installing version 11. It was a problem with our server, not AC. I called support, after hours, in a panic. They stayed with me until close to midnight getting everything up and running.
Good luck with everything.
Gene