Well, not a tough as a job as I thought it was going to be... although my first plug I put in, I felt something like a "click" as in using a torque wrench when it reached the proper torque. I didn't think anything of it at the time, but later found out I had cracked the porcelain/ceramic (what is it?) on the outside of the plug, 'cause it was misfiring as soon as I got on the highway to go somewhere.
Ford put those plugs in WAY too tight... had a heck of a time getting them out. In fact, I had to hand over removing the front one on the passenger side to my friend (who is a mechanic) as when I tried to remove it, the entire thing shattered to pieces. Luckily, it was just the outside and didn't require to do anything "surgical" as he called it.
All in all, everything is working just great. I can't wait to fill up again to see IF it makes any difference in my gas mileage. I am thinking about having my fuel injectors serviced at the dealership (anyone know at what mileage that is usually called for anyway?)
Thanks all,
Tim