I did mine myself, and I did a terrible job (at least I think). I got it on straight, but I had a lot of water and air bubbles. I knew eventually that they would evaporate away, and they did, and it looks perfect! If you get it on straight with no giant bubbles the imperfections will heal over time.
I used a brand called Xpel that I bought off a member. The install called for a mix of water and isopropyl alcohol; which is slick surprisingly.
Fox Hound: Liquid Stang - Sniper Focus - Decoy Escort (or was it a Tracer...)