Ok here is the easiest way to go about chaning your thermo stat. First locate your lower radiator hose. Fallow it(should lead to a spot under yoru intake maifold) Take the two bolts off on each side and pull the hose and "cap" back. Your thermostat should be right there. Pull it out and put in a new one, make sure you use a NEW thermostat gasket. They only run a couple of bucks, so don't risk having to do this over again. Now if your like me and don't have skinny arms and can't do jack with your left hand, I suggest putting some gasket sealer on the back of the gasket to hold it and the thermostat in white you bolt the cap back up. If you don't it will slide/fall out if not careful. Anyways, after letting the sealer settle bolt the cap back up and you are ready to go. Here is a copy of the page out of the book just so you know what you are looking for.
http://www.binghamtonlife.com/manual...es/91-10-6.jpg