Racing stripe installation

My car has the stock 02 GT hood with the raised scoop. I would like to have a black racing stripe (wide center stripe with pinstripes on either side) on the hood of my Mustang and possibly the front bumper. I have seen vinyl decals at auto parts stores that have all of this as a one-piece application and the prices are much less than anything you can order online. Would I be stupid to simply buy one of these and attempt to apply it myself? I don't want it to end up looking 'ghetto', but if the materials are just as good and I can put it on fairly easily, I would as soon not spend a couple hundred bucks on something that can be done for much less. If this is something I can do myself, anyone have any good links to how-to articles on this subject? How much more difficult would the job become if I decided to take the stripe all the way from the front bumper, across the hood, over the roof, across the trunk and down the back bumper? Thanks.