Let a pro do it. Seriously. There is a ton of prep and all kinds of little tricks to get the job near perfect. I know I used to do it years ago. Now I have my bud Nick do it since that's how he makes his living. He knocks it out in short order and I get to be stress free.
Not sure if there is any compound curved glass on an Element. If there is you need to shrink the tint to the glass on the outside or you will NEVER get it in. Many methods for shrinking too. Fabric softener, talc, dry, etc... Other thing is using a top grade film. The stuff you get at the local auto parts store ain't gonna cut it.