A:Answer I take it you are getting rid of the Pacifica? Either way the wiring is very close to being the same, right down to the color of the wiring. I dont see why this would cost more than $75. That is if the sub's and wiring are easy to get to.
I would probably do this job myself, and pocket my $75. But... I used to install them. If you have no tools and do not know how the systems work, then do not touch them. Let a pro do it right, with a warranty on their workmanship.