Hi,
What year is your Pathfinder? Did it have a Bose stereo? It you had a Bose than installing a new head unit if tough, but not impossible. If you had a standard regular radio it should be pretty easy.
I would call a local radio shop, Best Buy or Circuit City. They will have a wire harness you can buy that will match up with the Pathys connectors. No cutting, no electrical tape.
