change the O2 sensor and the catalytic converter?

Hello,

Before you get started you want to make sure that the engine is cool.
Raise and support the vehicle with jack stands.
You will have to remove the drive shaft in order to get the converters out.

https://www.2carpros.com/articles/catalytic-converter-replacement

To make the removal of the oxygen sensor easier, you will have to use a oxygen sensor socket.

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

I have attached replacement procedures for the catalytic converters as well as the oxygen sensor.

Please let me know of any questions.
Thank you.