Welcome to JustAnswer.com! My name is DriveFast71(Ron) and I will do my best to answer all of your questions completely and accurately.
Replacing the Thermostat is not a bad job at all. The best access is from under the vehicle, as the thermostat housing is at the end of the lower radiator hose. I've wrapped up the procedure into a PDF file, with images, for easier viewing/printing.
Download the procedure HERE