I have not any prior experience with installing custom ROMs, but after trying it out (and getting stuck, and googling and finding answers) I successfully did it. Below is my home screen if anybody is curious:
I use OpenBoard for my keyboard. Unfortunately I am still dependent on Play Store since some of the apps I need can only be found there. Sometimes it feels meaningless committing to this whole thing because I'm not perfectly private; then I think this is better than using a regular iPhone or Android phone.
So far I'm liking it. I am naturally inclined to feel hesitant about using this as my main phone and plugging in a SIM since it's custom, but I'm slowly making the transition.
Feel free to share any beginners advice or your own experience using GOS for the first time. Cheers!
Does it have any benefits over just running pihole, other than reliability?
You aren't always home, therefore when you aren't home it's useful.
I have not yet looked into the DNS topic. What are the risks if I use the provider's default DNS? Or what are the advantages of using a different DNS?
ISP DNS servers often lies, depending on your country, a lot do DNS blocking so it's a way to evade basic censorship. Also some alternative DNS can lie in useful ways, for adblocking or malware protection. You can also check mullvad DNS.
NextDNS even let’s you customize your DNS filter. You can choose which blocklists you want to use, and you can manually whitelist/blacklist individual domains. It also has other cool features like parental controls and malware protection.