Here is a link to Auto Zone.com and they have not only the directions for how to install a thermostat on your Ford, but they even have pictures of every part that you need to use, and the safest ways to proceed.  PLEASE NOTICE that they tell you to put the coolant that you must drain before you start to replace the thermostat, in a sealed container.  This way it will not poison any animals that are attracted to its sweet smell, and you can reuse it, if you choose to, because it will not be contaminated, if you catch it in a container that you can seal.  You should be able to print out the directions and follow them step by step with a great result. http://www1.autozone.com/az/cds/en_us/0900823d/80/12/6b/bd/0900823d80126bbd/repairInfoPages.htm.