It's official... I'm wearing my first set of trays now. It's kinda weird... imagine those wax lips you used to get when you were a kid... now imagine making the wax cover all of your teeth, and having it there all the time (minus the yummy cherry flavor), and that's pretty much what you got. They put little cement bumps (yes, that's a technical term) on your teeth to hold them on, and you change them out every 2 weeks.
I'm about 6 hours into mine, and I'm dying to take them off. Hopefully I'll get used to them soon :)