Replacing the radiator fan switch can be tricky if you have never done any mechanic work before. Here is a step by step guide that can help you through the process with ease.
Step 1 - Unplug
Begin by turning the car off and allowing it to cool down a little. Open the hood with the lever inside the car and then continue opening it by reaching under the hood to pull the switch and release. Then you can follow the wires and unplug the actual radiator fan. You may want to consult the manual if you aren't sure which one to unplug.
Step 2 - Remove Fan Switch
Remove the fan, shroud and switch using a wrench and socket if need be. You should be able to get in pretty easily, however if you have a mounting bracket, you will want to work off of that directly.
Step 3 - Reassemble
Install a new fan switch in place of the old one and replace the other parts. Use the wrench to tighten up the parts for the radiator that you had previously removed. Once you are finished, make sure that all of the mounting screws from the bracket are tightened if need be and replace the hood, making sure that it is tightly shut so it doesn't come up as you drive.