It's not that hard...but it IS that much work...
The whole intake manifold has to come off to access the thermostat. It's a good time to replace the intake gaskets.
Also, when you finally get to the thermo housing, there is a hard pipe coming off the back side that is sealed by an O-ring, (it is a feed or return line for the heater core) if you bugger up that O-ring upon disassembly or reassembly, you won't know it until everything is all back together & you're adding antifreeze, which sucks because you have to tear the whole intake off AGAIN to fix it...
You can guess how I know this...
Might be a good idea to have a new O-ring & intake gaskets on hand when you do this...
Also, give all the rubber hoses that are routed under the intake manifold close inspection & replace any that look even slightly cracked, to prevent problems in the future.
I'm not 100% sure on replacing the gasket between the top & bottom halves of the common chamber, (intake plenum) as I've only done this on a supercharged application, (different intake) but it is probably a good idea to do as well.
http://www.rockauto.com/
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