Make sure the car is cool and washed.
Measure where the decal will go on both sides for uniform positioning. I
used blue painters tape to mark the edge of where the decal would go and
removed after decal was set.
Use one of those plant spray bottles.
Fill with about 20 oz. of water and 2 drops of dish liquid. Use 3 drops
if the weather is really hot and dry. This gives you more time to set
the decal into place.
Peel and spray the tack side of decal and work into place.
Squeegee all the air and water out completely. This is critical. It will
greatly extend the life of the decal. When removing the air bubbles,
spray some of the solution to the top side of the decal. This helps to
prevent scuffing, scratching but be careful not to stretch or distort.
Double check and triple check for air bubles. They always seem to come
back. Once it dries, it's too late.
Finally, stay out of the rain for at least 24 hours.
Here's some pics of mine so you know I'm not full of hot air. :-)