2005 Outback Wagon 3.0 L.L. Bean
If it's just a few wires or even thick cables it's not too difficult. I use an old antenna which has a sharpened tip to poke through grommets. A coat hanger will substitute. Care must be taken to avoid poking into looms or anything that can't get nicked. Tape the wires to your wire fish. Lubricate the fat part you taped up so the wires slide through the grommet.