Activating New XB8-T to Ensure Xfinity Voice Still Works

I was recently notified that the plan I have qualifies for a upgrade to my cable-modem at no-cost (my plan included 1.2 Gig downstream speed). It just arrived and is the XB8-T cable-modem. I have Xfinity Voice as part of my services and have had problems in the past, with other equipment, just swapping in the new equipment and using the Xfinity App to activate it. In this case, since I have Xfinity Voice, I REALLY don't want anything "mucked up" if I do the self-install/activate myself. It also might be worth note that I haven't received a notice that Xfinity knows the new cable-modem has arrived and is ready to be Activated yet.

So thoughts/comments on the best way to activate this?