under dash wire harness

Thanks, anything would help. I was hoping that I would be able to replace just a couple of wires without removing everything but after cutting the loom I realized I would have to start from scratch. No wires were broken so I was able to replace them with the right length ok, but I taped the loom up as 1 piece over the instrument panel it didn't fit. I live in the Okanagon in B.C.