It really isnt that hard to do it yourself.
Before you peal off the backing, lay out the tint on you passenger side window, backing side up, cut around the edges, and bam, you now have the perfect shape for the inside of your driver side window, just peal off the backing and put it on.
TO avoid those bubbles of air..... or any other fuck ups when you put it on the window.... get a spray bottle of water sand soap..... hose down the window with the mixture.. that makes the window slippery enough for you to move around the tint once you put it on the window.... and makes it much much easier to push out the air bubbles with you drivers license.
If you want to be safe, just do one window.... give it a few days to see how it turns out, then either finish the rest of the windows, or peel off your fuck up and let a shop do it