Oxygen Censor for my 05' Honda Accord LX?

I need an oxygen censor for my 05' honda accord LX, they have one at autozone I can pick up. My question is, how hard is it to replace or should I take it to a mechanic and about how much do you think they will charge me? Thanks
 
How did you know that your sensor is bad? Replacing O2 sensor is easy it is like removing a nut and putting it back, make sure the wiring is the same.
 
How did you know that your sensor is bad? Replacing O2 sensor is easy it is like removing a nut and putting it back, make sure the wiring is the same.
 
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