NO, JUSTICE! DON'T TRY IT!!
I have a friend (well, former friend, anyway) who has been doing this type of work for 18 years. I've watched him do a couple of my cars and several of his customer's as well.
1. Only the best film lasts more than a few years. The stuff most people can get their hands on will turn purple, delaminate or get huge bubbles in it.
2. ANY little speck of dirt that the film touches will end up between the glass and the film.
3. ANY dirt that is in the window channel or at the base of the tint gets sucked under the tint by capillary action as the tint dries.
4. If you miss any air bubbles before the tint dries, they're yours to keep, like a gift certificate on Wheel of Fortune. And they become the weak part, get knocked off later and create a hole.
It's just like applying stickers, except you cut the tint to the proper size (approx), then peel off the protective layer and apply it to the window while both the tint and the window are wet. Before it starts to dry, you have to both smooth out all bubbles and trim it to the exact place you want it to end up without moving the piece as a whole.
If the window has a curve to it (luckily Montero glass is pretty flat), you have to use a heat gun to gently stretch and curve it.
The tint should be trimmed so that it doesn't extend to the edge of the glass where it meets weather stripping. You still want the whole window tinted when it's rolled up, but running the film right up to the edge of the glass will create an edge where damage can start to occur.
If you put a visor strip on, it cannot legally (in most states) extend below the line on the factory glass marked AS-1. I'm tall, so I can't even stand to have it go that far.
Be mindful of state laws concerning what level of tinting shade is permitted on certain parts of the vehicle. You can Google that.
Also be aware, if you haven't wheeled a tinted vehicle at night that you really don't know how dark those windows are until it's pitch black out and you're trying to back up.
You can't roll the windows down for a day or two after it gets done and you shouldn't use ammonia-based cleaners on it at any time. That's what they use to get old tint off.
Other than that, no problem. But I wouldn't try to do it.
John B.