[Q] Cyanogenmod installation

Hiya,

I've got a rooted 4.2.1 Samsung GS3 GT-i9300 network locked to Orange and I want to install cyanogenmod, I know exactly how to
but I'm scared.
I've got a friend (even more nood than I am) he installed Cyanogenmod for GS2 on his S4 (lol) bricked it.
(But I obviously know not to do that )
Anyway,
I'm just scared of the whole idea of bricking the phone.
What would be the worst case scenario of I do everything right?
I have previously installed a custom rom on a tablet, but that only was because I got instructions from the guy next to me.

I know exactly how to install the rom but what could I expect?

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