Did my 03 with 97,000 miles. Took 4 hours. let air out of front tires and went at it. There is a good write up on (I think the name is) ford enthusiast web page. Don't guess at torque, confirm with couple sources prior to digging in and(without anti seize) was my choice. Only big surprise I got was using seafoam after changing plugs. It gummed up injectors and had to pull them one more time and get them cleaned up. And about 6 months later fouled up another injector (# 2 hole), so it does break up junk but where does it go is the problem. Did have to buy little metal cap things for top of socket to be able to use a wrench for the hole closest to passenger side. Torquing it back in was a "crows foot" I also used vaseline on little rubber boots on fuel rail and injector. Don't be surprised if you find water or junk underneath boot. Use air gun, watch your eyes (rusty water, chips go flying) Water drain at top of hood is at bad spot water runs off cowling then onto motor, at least on my year.
If you use seafoam I would change fuel filter before starting and every 3500 miles for about 7,500 miles. Read to many horror stories about brand X parts, so I only put motorcraft back in. I also changed COP's at same time.
Some time ago somebody ask the same thing and somebody posted a link to good info about 5.4 plug change maybe you can find using the search button.
You shouldn't break any plugs most of problems worked out by 07 IMO use /soak some oil as others have said.
On the spark plug socket, when I would pull it out, the socket would disconnect from extension and stay in hole. That rubber works better than I thought. Instead of glueing them together with JB weld or something, I took out the rubber boot and fished out plugs with a cheap magnet pointer thingie.
Make sure to start plug right. I put a long bolt inside a rubber tube (vac hose line, couple bucks for a foot)that the tip fit over plug top, so I didn't cross thread.
If you get stuck probably a lot help on here.
Good luck and 1 question if you know....
When should they be check again? I ask because I've heard many different answers to that question.
