It really all depends on the type of vinyl they used to make your stripes, if they recommend wet yes you can use a mixture of water, dish soap and alcohol but it does not work that great on large graphics, get yourself the smallest amount of application fluid you can get maybe ten bucks, flood the crap out of the decal and the car and use a good stiff squeegee, work your way from the center of the stripe out and from end to end you won’t get any bubbles.
Now if they recommend dry do the same thing minus the fluid the benefit of dry is you can pull it back up to adjust or if you get a bubble and put it right back down as long as you have not really burnished It or heat sealed it yet.
I just did these for a guy a couple weeks back, dry install.