I did my own in my garage. Took me at least 7 hours. Not hard but you do have to follow the directions.
You make a mixture of original dawn dishwashing liquid (it has to be dawn) and put it in a spray bottle. You spray the stripe and position it. At that point you use a very soft squeegee to push the solution and any air bubbles out from under the stripe. The key is to follow directions and not to rush!Do you wet soap the under side so the vinyl can slide and at what point do you press the vinyl to the car?