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Hi and welcome!
When you feel unsure about the installation process I second Side of Burritos on YouTube. The videos walk you through every step and you can check weather it's normal if your phone does this or that. I recommend watching the videos alongside the GOS install website to get to know your system.
For me the best part about GrapheneOS is that I regain control over my data and may device. I was a long time iOS user before I switched to GraphenOS and whenever I touch an iphone again (job or friends) it feels weird and almost childish. You can decide if you choose to install apps from app stores, download from GitHub or mix and match. Either way, you can choose and having a choice is part of digital freedom (also real freedom but that's a bit to much pathos for now).
Also the community is very helpful, you get help in the matrix channel in case you got stuck during the setup process, and chances are good you'll find somebody coming up with the right solution. There are some highly qualified people around here, so if you stick to Graphene you'll learn a thing or two about privacy and security as a bonus.