Should be something the dealer can do for you, especially if you bought the stripes from them. I wouldn't think they'd charge more than an hour labor ($65 or so). Some might even do it for free, depending on your relationship with them (bought the car there, oil changes, maintenance, etc).
I had mine done at a local glass tinting shop. If they can install window tint and the clear shield paint protection (clear bra), then they can install stripes. They were 1/4 of the price of the local performance shop and did and excellent job!