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Switching from iOS to Android is always a bit of a pain, especially for users who have been in the Apple ecosystem for a long time. GOS adds another layer of complexity to that.
So, my advice is this: take your time, don't pressure yourself into going Google-free or FOSS-only right from the start. Make GOS work for yourself first, and then gradually improve it based on your privacy needs.
Keep in mind that even if you set up GOS almost like a regular Android phone (with Google Services and Google apps in your main profile), Google Services is still sandboxed, which is a big improvement over any other Android system. For instance, Google won't be able to track your location 24/7 unless you explicitely allow it to do so and you can also control permissions of apps that aren't even exposed on regular Android. Plus, you own this phone now, not Google (or Apple, in case of your iPhone) because they / their software don't have privileged access to it.