There's probably a thread on this, but the quick version is 1- take out the stripe and hold it up and get a sense of where you want it to go on the door, you can use a grease pencil to make a few wee reference marks. 2- put a few drops of dishwashing soap in a squirt bottle and completely spray the previously clean/degreased door. 3- pull the first 6" of the decal's backing away being gentle and not stretching/tearing it, place it on the door allowing enough (1/4") for the edge wrap-around. 4- using a fairly stiff plastic squeegee, gently work any bubbles towards an edge and out from under the decal. 5- once you've got the first section on, you can usually, carefully pull off the rest of the backing and position the decal where it should go using your reference marks and the MkI eyeball. Continue to GENTLY work the bubbles out until the whole decal is bubble free and then you can go over the whole thing a tiny bit harder and finish the job. You can pull the decal up/off if you get screwed up if you don't squeegee the water out from under it first. PATIENCE IS A VIRTUE HERE!! Good luck