Thermostat

I have 1984 Ford Mustang L 3.8 engine with 134,000 miles. It is runing hot and at times overheating. The prior owner has a detailed diary of repairs and I see that the thermostat has not been replaced since 1997. I am female and not a wrench, but believe I can do this job. Please verify for me, that the thermostat is located on the top of the manifold where the water hose enters it? Thank you.