I did this years ago on a VW scirroco. To get the compressed air in the cylinders, just "gut" a spark plug and weld on an quick disconnect air fitting. If you don't have a welder, ask around, a friend should be able to do it in 5 minutes!
I was a teenager when I did this DIY job and was when I really started to like working on cars, especially tackling jobs that needed "special tools" that I would work around. While this is not brain surgery, you should some basic experience under your belt beyond just oil changes. If you get stuck, just put in a post!