how do i replace a thermostat control unit - degree of difficulty?

same car with same problem i had to fix. do yourself a HUGE favor and spend the $135 at parts store to get everything in one . i tried a good one from junk yard for $20 and it lasted all of 2 months and broke too. it is a tight job in a small area but if u got 1/8th inch socket set w/ swivel then use those and it will be faster . took me about 35/ 40 minutes roughly ( dont loosen up or try removing upper intake manifold or your in for a huge head ache ) TAKE MY WORD FOR IT