Scotty, I need to know how much trouble I put myself into with this one...

I have a 2005 Toyota rav4, automatic transmission, 4wd LE model with 92,800-ish miles on the dash. Previous owner had to give it up due to age, and I couldn't pass on it. Only issue was an eyesore of a ding between the driver side front and rear doors from an accident they had gotten into.

The good news is I have a replacement set of doors (same year, some model, even color too!). Bad news is driver side door wiring harness is toast due to my impatience. I cut the wiring harness thinking the connector was too deep in the door to unclip while also holding the weight of the unbolted door at the pick n pull I got it from. I can use the wiring harness from the damaged door, but I have no clue how to thread it through between the sheets of metal that make up the door. What tools would you recommend for the job?

I promised myself I would be more patient with this part of the job, 

Thanks Scotty!