Never fear. Find a friend, show them this Instructable, and you'll be in good hands. My friends dubbed me Head Elf Ear Artist and I don't even know how to apply normal makeup. (They were busy with their own Instructables, and you can't do your own ears. You just can't.)
Step 1: Acquire supplies and allow yourself enough time
- A pair of elf ears
- A very small amount of spirit gum (Structural)
- Spirit gum remover (Any oil you're willing to rub on your skin)
- Liquid latex (To smooth the edge between prosthetic and skin)
- Makeup (You'll need special makeup to put on the latex. Normal makeup will break down the latex, and not stick, and you'll panic thirty minutes before your event. Don't laugh, it happened to my friend.) (The makeup we got, Ben Nye, was very very stiff. A liquid would have been nice for basic coverage, at least.)
According to timestamps on the photos, I was able to complete one pair of ears in 45 minutes, including drying time, but I would allow two hours for your first attempt. Liquid latex can cover a multitude of sins, but it takes time to dry.