Best Way from Trunk to Battery?!

Whussup everybody?

I am putting in a powered subwoofer in my trunk and wondered if any of you out there know the easiest, preferably, step-by-step instructions to get a power cable from a trunk to a positive terminal on the battery.

I know I should go underneath the carpet, but I would like to do it without taking out half of my interior out.

Has anyone done that?

By the way, I have a '99 Civic EX Coupe.

Thanx.

Drumboy69