It wasn't really hard at all. Just pop off the upper grill, and screw it on. As for wiring, I just hooked it up to the battery and ran a switch down near the trunk and hood releases inside the car. As for the size, it's just a regular 15" tube.
The grill is the 99-00 grill. Last summer I gutted the grill leaving only the outside intact. Then I added some gutter guard mesh and painted it black. For the emblem, I cracked it open, scraped the paint off the back of the cougar head, and drilled out the back so it would be hollow.
This morning I went out and changed the cougar emblem a lil bit. Here's 2 new pics:
New shot with the light on
A shot of the emblem itself