> The same way anyone lacking knowledge can confident say that they got the right information from anyone with experience: You don't.
No, that's not the same way that anyone lacking knowledge gains confidence in the things that others tell them.
A technique one can use instead of blindly trusting what one person may tell us is seeking out second opinions to corroborate new info. This works for many things you might not have personal experience with: automobiles, construction, finance, medicine, &c.
