Logitech G29--Set up Issues?

United States
United States
Longtime fan of racing games, but fairly new to using an actual steering wheel.
I just picked up the Logitech G29 and downloaded Assetto Corsa Competizione to my PS4.

I found a beginners guide on YouTube and have tried to follow that to get started. I'm trying the practice laps and the wheel is rocking back and forth, even in straight sections. The cars are nearly impossible to control, regardless of how slow I go. I feel like something isn't set up correctly with the wheel.

Can anyone point me in the right direction to get started?
I really appreciate any help I can get!