its very easy to do, for the looks of it you have one of the screws of already out now for the other screw you need a 1/4 inch extencion and a 8mm sock it, then once you got them screws off you want to go under the car and loosen up a 13mm bolt thats holding the metal pipe to the oil pan, once thats off you can pull the pipe down and the thermostat will come out. when yo put the new one on make sure the thermostat sits in there with the weight up..ok, you will be able to put it back on with no problem from the top of the car by your self, dont forget to get the gasket for it also, its just an o-ring.
well hope that helped, if not ill try to get some pics on how to do it
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