It really depends on the laws of where you are and what knowledge you have. A significant portion of the time if you have some nominal level of training, but less than professional training/standing then you’ll be covered by ‘good Samaritan’ laws. (I’m only talking about the U.S.)

If you know nothing about what you’re trying to do then the odds are you’ll still be covered, but don’t do that. If you have professional training/standing then you might be held to a higher standard.