The first thing to do is read through the tutorial very carefully - and preferably more than once. This is not a trivial GUI procedure like the Fedora upgrade was, or like many of the previous Mint upgrades have been. It requires use of CLI commands, and those commands produce positively scary amounts of text output. It takes a relatively long time to perform the complete upgrade by Linux standards (it's done in a flash by Windows upgrade standards), and it is not entirely automated, so it will require manual intervention numerous times along the way.
Mint 18 Xfce Imminent, Gmane.org Shutting Down
Mint project lead Clement Lefebvre today said that Mint 18 Xfce is "almost ready" but KDE users will have to continue to wait. The second alpha in the Ubuntu 16.10 developmental cycle is available to crash testers as of today in Lubuntu, Ubuntu MATE and Ubuntu Kylin flavors only. In other news, the Gmane mailing list archive site is shutting down as the founder has grown weary with the hassles as well as a prolonged DDOS attack. Finally today, Carla Schroder shared her Linux story.