Anyone know how to change an oxygen sensor?

I have a service engine light coming on and off intermittently. Scanned the code and it reported the mixture as being too rich, and that the O2 sensor (Bank 2 Sensor 1) was reporting slow or something like that.

Guy at auto zone said that it was on it's way out.

I want to get this replaced ASAP before i nuke my cats.

 

I'd recommend getting the O2 sensor socket from Autozone and just using that... Other than thats it not very hard. If you look under the car I'm sure you'll figure it out.