Great question!
For the 12 valve "Vulcan" engine, there is a decent amount of room to get at the rear side of the engine and plugs.
So a typical collection of socket extensions to go with the plug socket will likely suffice.
The 24 valve, Duratec DOHC engine is a totally different matter!
Getting at the rear plugs is a much more complicated under-taking. The most popular approach to dealing with the lack of room is to remove the upper intake manifold.
Don't panic just yet - it's not a difficult or risky task. Just adds some extra steps.
For this, you'll want to have a good assortment of smaller sockets, pliers, socket universal joint and a bucket of patience.
The "Related Questions" below are full of instructions, hints and tips on changing DOHC plugs and wires.
NOTE: if you discover some new tips/tricks, or develop your own sage advice to share, please chime into any of the questions, or come back to this one!
Helps out the next backyard mechanic with your shared knowledge.
Special tool required to disconnect lines available at Napa
What year? It may require special tools.
How do you change the water pump in a 2002 ford Taurus
how do you change the front motor mount on a pice of crap 90 Ford Taurus
Remove it with special tool from exhaust manifold and reinstall new one with hi temperature anti-seize grease.
What year tracer? Some you need special tool to pull bearings and hub as a unit!
Check the Mercury Villager manual to see if there is a special procedure for cleaning the fuel injector. If not, you can purchase cleaner. You can also have the injectors cleaned by a mechanic or an oil change company.
Change ignition.
YES, because evaperation is the same as changing it in to a gas which is a physical change.
Parking / Running light bulbs are inside the headlight housing.Refer to the "Related Questions" below for specific instructions by model year groups.
Physical. The mercury doesn't change.
Not really other than a Torx 40 or 45 socket. These are pretty standard on front brakes these days, so you should be able to find them and not have to spend a fortune.See "Related Questions" below for more about Taurus brakes...