Hello, all. I just bought a 2003 FX4 Screw, 5.4L a couple weeks ago. I was curious as to how much it would cost to have a mechanic change my plugs. Well, I found out real quick that I wasn't going to pay to have this done. So, I did some research on methods used to accomplish this, and found this one to be very informative. It took me 6 hours to complete. I did remove the Triton cover and power steering reservoir, but not the fuel rails. The hardest one to get to was the rear passenger one. The 7mm bolt holding the COP on was very hard to get out. I put Motorcraft plugs back in(exact same ones in the guide), gapped them to .054" and torqued them to 28ft-lb. No anti-seize was used because the nickel alloy used in these plugs will prevent them from seizing. I used a 5/8" magnetic socket to ensure the plug came out, and then I would put the new plug in the socket with an extension to start the plug into the threads. Once that was done, I switched to a regular 5/8" socket. Also, I did use dielectric grease inside the old boots before I reinstalled them. He is not joking when he says use a variety extensions. You MUST have 1/4" and 3/8" drive extensions and swivels/universal joints, a shop vac and compressed air to get this job done. Another thing I found helpful was a pen magnet in case I dropped any of the screws. I used it several times to retrieve bolts and sockets. I want to thank you for a job well done on this how to guide. It really saved me a lot of time and money. I don't have much free time to do this stuff since I'm in the NAVY, so it's much appreciated.