There's a difference between taking some ideas/interpretations and straight out copying someone else's work.
Someone asked this question in my class last year, and my teacher said he was correcting an essay that sounded a little bit rote-learned. He consulted with some other markers and they noticed there was about half a paragraph that stood out as poorly written, but relevant, and the rest was all just sophisticated gibberish. They googled a few excerpts (and yes, AN results do show up on google) and sure enough they found a version of that essay online. The convention in these cases is to simply cross out everything that's not your own work, and mark what's left. So this kid ended up getting a two for the half paragraph that s/he'd tried to write.
The markers aren't idiots, and they have a very good radar for this sort of stuff. You're doing VCE for the first time; they've gone through the system year after year and marked hundreds, even thousands of essays.
So you might not fail exactly, but you can potentially have an entire essay score (or three) nullified. So yeah, don't bother.