The plugs are underneath the coils (little round things that have Motorcraft on them).
You will need a 7mm wrench or socket (I say socket) and take out the retaining bolt. Unplug the coil and pull back and out. It's long, so don't freak. The whole boot is rubber, so it will bend. Use an air compressor and blow out any dirt in the hole before removing the plug. Then use a 5/8's spark plug socket and an extension (preferably a wobble extension from Harbor Freight) to remove them. Before you put the new plugs in, put some anti-seize compound on the threads. Then tighten them down snug and place the coil back on.
Here's a tip. If you end up buying the wobble socket extensions from Harbor Freight (which is highly recommended), take some electrical tape and tape the socket to the extension. Mine kept getting stuck on the plug and would come off the extension. Taped down it shouldn't be a problem.
Hope that helps.
http://www.harborfreight.com is their address. Do a search for wobble.