How hard is OSCP ?

Hello !

I'm still in an apprenticeship, but would like to work towards OSCP.

How hard are the OSCP Exam compared to HackTheBox boxes ?

Considering I'd rather already know "everything" before I start following the course, which difficulty should I be able to easily clear to be "good enough" for the OSCP ? (That's the only metric I really have, sadly)

On a side note, i'm in the EU and my only current certification is the CCNA, is there …

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