Still recovering, Not an easy job, mainly due to the location of the connectors for the downstream sensors.
Tools needed:
17mm wrench, a stubby wrench would be handy, I used a 6" adjustable wrench once I got it loosened a little for the upstream upper sensor.
2 ft 3/8" extender and a 17mm crows foot, tubing style preferably because it stays on better. I had to run to Harbor Freight for get these. I had a crows foot set that unfortunately was missing a 17mm. 11/16" might work but it's a little oversized.
Those connectors for the downstream sensors are ridiculous. They're mounted to a bracket attached to the engine near the firewall. It has a third connector, not sure what that is for but there was almost no slack on the wire it goes to on the bottom. Used a 1/4" ratchet with a 10mm socket and a universal joint adapter to remove the bracket. I had to remove the third connector to get some slack and they I could remove the O2 sensors from the bracket. (one at a time) I have small hands and it was stupidly hard. I managed to get all the connectors back on the bracket after about an hour but couldn't get the bolt back in the bracket to attach it back to the engine. Ended up throwing in the towel and zip tied it to a cable bundle. You basically have to sit on the fender/coolant tank to do this which ended up knocking the coolant level sensor out of the bottom. Luckily it just pushes back in to the bottom of the tank. It's in a tube so not actually in the tank.