Update: I consider myself pretty handy, but after starting on the plug change and having some difficulty removing one of the hoses (and then getting confused figuring out what was what based on the instructions on here and on youtube), I got cold feet and backed off. I called a buddy who is a mechanic and he said he would come over and help me with it if I gave him some cash, so that's what we did.
He made it look easy. He didn't even want to use the torque wrench; told me it would be pretty tough to get the plugs too loose or too tight and he had done so many of them that he could snug them by feel. Okaaaay. Took him about an hour to do the whole thing. I asked him why the shop said it would take so long, and he said that they just always over-estimate, that way if it ends up taking longer for some reason, they are covered. He said they do the same thing at his shop too.
Anyway, I have new plugs now (Edge is running great) and I saved a couple hundred dollars without the fear of screwing up the job. Bottom line: this job isn't a cake walk, and there are things you could screw up big time if you don't know what you are doing. And the way things look under the hood may not match the instructions you find online, as I came to find out. My advice would be to know your limits and proceed with caution.