No need to be rash and get a Toyota, life is not that bad. I would try to get to the thermostat from the back by crawling on top of the gearbox. Remove the engine cover, air filter - put a rag or tape over the carb to stop dropping parts in the engine, you may have to remove the distributor cap or disconnect some leads - may sure you note where they go.
Disconnect a pipe from underneath or just all the water / antifreeze come out when you remove the thermostat 2 bolts. It is normally treated as a hazardous waste, don't get it in your eyes, you will know why.
To fill up use the older "green" style anti freeze. The modern stuff is not compatible with the copper / lead / solder in the heater and engine radiator. It also needs to be replaced every couple of years to prevent corrosion.
Picture from the back. Still not easy to see..
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