Just because its lean doesn't mean that its bad, fwiw.
I have never changed the 02's on my mustang, but I have on my camaro and its not that big of a deal.
Find where they plug in.
Unplug them from the harness.
Plug new ones in and screw them back in.
EDIT: Just read the part about bank2. It should be on the passenger side.
Its highly unlikely the O2 sensor is bad because you are reading a lean condition on bank 2. You should check why its reading lean, it is more than likely a problem in one or more of your cylinders on the drivers side. Could be a misfire or a minor vacuum leak. You should find the source of the issue first, if you replace the sensor and not fix the source problem it will just return.
You could always swap sensors and see if the code follows (changes to bank1), if it does replace the sensor, if not then like the above post said you might have a vacuum leak.I think it could also be a dirty injector or exhaust leak.
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