If you want to remove an aftermarket tint, then remove it in place. Best to use plastic razor blades. They won't scratch the glass. You still have to be careful, but they are perfect for this task. Here is a sample. Reminder, most all of the aftermarket tint is applied in place without removing any glass. Its much harder to install the stuff, then it is to remove it. But to make it easy for you and not damage anything, use the plastic razor blades. I suspect a regular hair dryer might assist you along the way. (NOT a commercial paint remover heat gun -- way too hot!)
On the other hand, the question you've asked is how to remove the small window. To do that you have to remove the glass rubber/steel surround. First put the glass down in the track. Next remove the door trim panel, then remove all the bolts that hold the surround in. Then remove the surround. Once the door glass surround is removed, you will be able to see exactly how the small glass is held in place...
This isn't exactly your model year, but you can get a glimpse on how the stuff is installed.
Recommendation: Check out a Chilton's or Haynes manual for your vehicle. $30 USD well spent. That will tell exactly how to remove the door trim panel without messing anything up or cracking plastic anywhere.
Edit: I just realized you want to remove AND reinstall the window tint. I have to say, there is no way to compete with the very cheap price the shops here charge for the install. There is definitely an art to this, and those guys to 10 or 15 cars each day every day. They are truly experts. I happen to live in Las Vegas, and a large number of cars here get tint because of it's sunload blocking properties (to reduce Air Conditioning cooling load.) Maybe its time for a mini-vacation to Vegas, or Tucson or Phoenix?
