Not having done this type of work before aside from the occasional club sticker on a window, I'd say it was actually pretty easy. I read the supplied instructions over and over and followed them pretty closely. I measured the car to find center for every section individually with a fabric tape...
So after searching a few local vinyl shops for someone to install my BigWorm dual-color narrow stripe kit and no one wanted to do it, I decided to do it myself. It's the matte charcoal/gloss red combo.
All-in-all I'm very happy. Took about 4 hours to do it and took pictures all along the way...