Mr H.
Changing the plugs is realatively easy, see my post above for tools. The breaker bar is not a requirement but I use it to loosen #4 plug (rear, drivers side) because I have little upper body strength and that plug is harder to break free and I don't want to strip the socket or break the plug. Otherwise a good 3/8 socket is OK.
1. Remove the COP cover, 2 X 10MM short bolts)
2. Remove the COP (one per plug) by pulling up, try not to jerk them so that the spring that grips the plug is not stretched. You do not have to take the electrical connector off each cop, but if you do "unlock" the tab first so you do not break the connector.
3. with a 10" extension (or longer) fitted to a grip style spark plug socket,"break" the plug free and remove plug. My plug socket and extension are welded together to keep the socket from falling off the extension.
Keep the tool "string" aligned perpendicular with the plug.
The two middle plugs on the drivers side may require the inlet air duct to be removed, or a "universal adapter" may be needed to get around obstacles.
4. inspect old plug, threads will probably be lightly coated with oil (not really wet).
Tip should be tan to light brown. If plug is fouled with heavy oil that is an indication that the plug is bad or that cylinder is not firing.
5. Check the gap between the ground strap on the plug and the tip. Use a gapping tool if necessary. Gap should be around .052 - .056 inch. I recommend motorcraft plugs. Plugs are not pre-gapped. Check 'em.
6. Very lightly coat new plug threads with anti size compound, do not get any on tip of plug.
7. Insert plug into gripping socket and then put plug/socket/extension into hole and start threading. Make sure the threads are turning with ease and not cross-hreading (bad)
8. Hand tighten then use torque wrench to finish tightening, 11 ft - 13 ft pounds or 132 inch pounds (at least), do not overtighten..
9. reinsert COP firmly making sure it is seated on the plug.
10. repeat for each plug.
Hope this helps, if I made a mistake I'm sure others will catch it and advise.
Regards,