Know your going to loose your data. So back stuff up and research some unbrick methods beforehand so you know what to do when things go wrong.
Discussion
Thank you for your response, does it mean I'll lose access to saving data permanently? Like taking pictures etc?
No, he meant that all the data that is currently on your phone will get wiped, after installing GrapheneOS it is like any other Android phone, but without Google. Here's a UnifiedPush alternative that uses Mozilla's push servers instead of Google's: https://f-droid.org/packages/org.unifiedpush.distributor.sunup/
It is something you'll need if you want push notifications (like incoming messages etc) from certain apps without killing your battery life, or at all.
More involved, but you can also self host NextPush with Nextcloud.
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No, that will be fine. But as a security measure it will wipe itself back to factory settings when you unlock the bootloader. So you want all your data backuped before then. Its because when the bootloader is tampered with its easier to install a backdoor. Pretty sure graphene allows relocking but you still need to unlock to be allowed to install it so in the meantime your going to trip that self delete once.