The flat areas are easy, the problem is stuff that curves both directions. If it is your first time tinting, there is a kit that has 6 inch strips for the back window that you overlap 1/8 of an inch that makes it easy. Just watch a few videos on you tube and remember some of them are professionals so they make it look easy. The key thing is to make sure everything is CLEAN, cause once you put the tint on there, it will show you where it has some grit by having a bunch of micro bubbles. The asteroid belt look on the back window is from using the defroster which should have been disconnected. The bubbles on the side is a puzzle to me, it may be from trying to dry it faster by using a hair dryer. It is best to install it in a garage since when you pull the clear backing, it lets mother nature know it is time for a breeze. When you start to peel the backing, keep it sprayed good with water because it is a static magnet to pull dust to it. You probably will want to have some extra, since when you get done with the last window, you may want to do the first one over (the learning window).
PATIENCE IS KEY, TAKE YOUR TIME
good luck