I'm working on that, but $500 decal is salty!
If you are going with a solid color and not a design, Amazon sells 5'x6' rolls for around $60. It is far more than you need for a hood. I did mine that way. The excess will leave you with enough to do your valance too if you choose.
Driving around a bit to warm up the engine helps stretch it across too. No need for anything fancy. A credit card, 60 bucks, extra set of hands, some patience, and engine heat is all you need.