In general it isn't that hard LineageOS has fairly clear guides. The main hitch is Google's Safety Net. Some apps want to validate that you are using a "trustw

In general it isn't that hard LineageOS has fairly clear guides. The main hitch is Google's Safety Net. Some apps want to validate that you are using a "trustworthy" OS. Of course by "trustworthy" they mean "obeys Google, not the user" Depending on the phone you can spoof it but it is more complex and a cat-and-mouse game. Currently it is working for me even with Google Pay but it is surely only a matter of time until they require hardware attestation which will be basically impossible to fake. Of course while Google is the enabler here, the real problem is the apps. They shouldn't care what OS I used and shouldn't check. I just avoid the apps other than Google Pay which check (not that I've seen any yet other than an old bank).