How do you change the thermostat on a 1993 GMC truck?

ITS EASY FIND YOUR TOP RADIATOR HOSE IT WILL RUN DOWN INTO UR BLOCK BY THE WATER PUMP. IT CONNECTS TO A NECK THERS 2 BOLTS HOLDING THE NECK ON TAKE THOSE OF THEN POP THE NECK OF THE BLOCK YOURE THERMOSTATE WILL BE SETTING RIGHT THERE UNDER IT