AP: Digipak - Self Editing Green Screen

Unfortunately before leaving to go on the school break i forgot to edit the green screen out myself using Final Cut Pro X. So, I had the unfortunate task of editing out the green myself in Photoshop CS6. I found a tutorial on youtube of the most effective way to do this, however i was pre - warned it could go wrong... which it did. Althought it got most of it out it did leave a mark all the way around the image which i had to edit out. This took A LOT more time than planned!