Very easy; the default is to have zero google proprietary stuff. In fact, you have to jump through some hoops to get Google play store, Maps etc installed, and it's getting harder and harder as Google locks its services down.
Simply set up your default search engine to DDG or whatever you want and your LineageOS phone will send exactly nil to Google.
My understanding is that completely de-googling the phone is somewhat hard because of Google Play Services being a prerequisite for many services. I understand that you can get by without it, but many people find that somewhat of a burden.
The main missing part is a good maps/Waze equivalent. I don't need anything else that's not available on F-Droid. Now I'm a GNU/Linux user of strict observance (depends only on Free Software!), so I probably don't have the same requirements as most.
Simply set up your default search engine to DDG or whatever you want and your LineageOS phone will send exactly nil to Google.