It's always funny when people overestimate their own ability to fight an animal.

Yeah bro i could fight a gorilla.

I don't think i could, honestly, but spears and shit from the hut would be my best guess. Or wait until it sleeps and ram it through the eye with full force and run like a motherfucker. In movies they often spear big animals and they live for a long time and cause havoc, i would assume a spear through the brain isn't good no matter the size.