the best thing to do is remove your kick panel, and the door panel. Then remove the boot going from the door into the kick. pull either the kick or the door side out first, cut the tape securing it to the wire cluster, and that will open it up. do the same on the other end, and now you are ready to run wire.
a flexible claw tool is always a good thing to have, if not, a wire hanger is second best. easiest way to do it, is run through the door first, into the boot, and then into the kick. civic's arent hard cars to run wires in, no molex connector to drill through or anything like that