The mechanic that did the test said i might need to change a oxygen sensor?

I googled around and found for the accord v6 lx


its about 80 bucks on ebay

should i try and replace this? The smog check says i failed the MIL Check Engine Light

and the fault code is PO141 O2 Sensor Heater fault bank 1 sensor 2

should i just order the part and try to fix it myself? or should i just bring it into a mechanic to get this done.. i really dont know much about cars so any help would be much appreciated

 

the 02 sensor isint hard to change. dont order one on ebay, just hit up your local advanced auto or nappa for the part