I am too nervous that i will end up bricking my phone.

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If using our web installer you can't, so long as your bootloader is accessible you can put an OS on it.

The advice received above about just following the official guide is paramount. Do NOT use third party videos if possible, USB debugging is NOT required.

Any problems let me know or visit our support rooms:

GrapheneOS Community https://matrix.to/#/#community:grapheneos.org

Give it a go, let the inner power user free.