Thanks for the help.
I bought the oxygen sensors and swivel ratchet from Autozone, and they loaned me the oxygen sensor tool (that is a pretty cool service).
Front sensor was very easy to change. Go in from the bottom, and itâ??s on the side of the pre-cat. Didn't even need to lift the car.
The back one was a little harder. I was able to do it from the top. Took off the coil pack (four bolts), reached behind and slid the tool on, attached the extension, attached the swivel ratchet to that, and off it came.