It’s Important that you apply your vinyl in 50 to 60 degree environment. Clean the surface with a cleaner. Take two pieces of tape and fix top corners in the approximate location.
Measure off a straight edge and adjust by lifting taped corners to desired environment.
Apply some new tape across the entire top creating a hinge.
Hing up the sign so you can peel off the back exposing the adhesive (sticky) side. Peel off slowly and be careful not to lift any letters.
Hing the sign back down and using a squeegee or credit card to apply the vinyl
After you have applied vinyl slowly remove the application tape, if you have any bubbles use a pin or an exacto knife to let the air out.