Use regular glass cleaner, clean application surface thoroughly.
Appy tape to the top portion of the decal, half of the tape on the decal, the other half on the surface. Peel away the waxed backing material. Decal will adhere to the transfer tape.
Once the waxed backing material is removed, begin pressing the decal firmly to the surface using a squeegee or a hard plastic strip. Rub down the entire surface of the decal.
Peel the transfer tape downwards and slowly.
If you end up with air bubbles, use a needle, razor blade, or exacto knife to poke small hole into bubbled area. Work the air out using the tool you applied the decal with.
CONGRATULATIONS ON THE APPLICATION OF YOUR NEW VEHICLE TATTOO!