How to overcome the scare of being caught when hacking?

I'm new to hacker zone so I wish anyone can provide any experience about their feelings of their first hacking activities when they knew they were hacking

I'm asking because recently I found a suspect zero day flaw in a website. I want to do some tests with it but as a newbie, even though I have confident, I'm afraid of being caught by the company for whatever the reason that could be my unknown-unknowns, and of course afraid of the bad consequence.

I do want to do some research but I have no idea of what jargon or keyword I expect to searching for....

I really appreciate someone can provide a hint.