Seriously.

I'm practicing MMA since 6 years now, then boxing simultaneously since 7 years, i could.

And also bodybuilding since 4 years, 1,87m for 86kg.

I own a crazy lightning speed, and reflexes identical to my speed. I just have to wait for him to attack me, to dodge him and punch him with potatoes multiple times in the head. I won't let him go at the slightest mistake, the gorilla is over. There will always be some virgins over here to think that it's impossible. Nothing is impossible with volition yet, my friends. And secondly, it's definitely not with your skinny coward body that you will do anything.

Any man a very minimum trained could beat a gorilla with a knife yet. Barehanded, that's not specially more complicated. It just requires more technique.