Thermostat is found where the top radiator hose ( big hose almost 2 inches ) comes out of the top of the engine. Usually just 1 hose clamp and a couple of bolts to get at it. You will loose lots of coolant doing this if you don't drain quite a bit out of the radiator first. Most important thing is to make sure the coolant refills up under the new thermostat. If there is a big air gap (vapour lock) your engine could overheat before the new thermostat gets hot enough to open.