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.

When in doubt about the consequences, don't do it, or postpone further probing until you have ascertained the risk, the consequences, and the necessary countermeasures (by employing operational security, or opsec).

To ascertain risk, start by figuring out if what you intend to do is legal.