I would start by watch this tutorial video by
@BTC Sessions https://www.youtube.com/watch?v=VnumtalYLFIMy big issue was the mis-reading of the installation documentation and getting eSim to work.
The eSim needs to functional on the Pixel phone first before installing GrapheneOS. I missed this step and had to go with a regular Sim chip.
Zapstore is my default store to use. I'm not an app junking so have very few additional apps installed.