Number 1 rule is to try it out on a second phone. Do not try with your current phone. Just don't.
Second rule : read the first rule again.
In all seriousness, I have had so much fun with mobile Linux OS's, trying out different phones and OS's but there's a deep learning curve and at the end of the day, there is not one that is completely ready to be use as a daily driver or have all the apps that I need - looking at you DUO Mobile (2fa).
However there is /e/OS, where is degoogled, has a built in tracker blocker and uses microG. Use it as a daily driver on my One plus 6t but its technically still Android. Someone did mentioned Murena, same OS.
Buy a cheap supported phone off of EBay and have a go. If you have any questions, let me know.