People trust precision more than confidence after being misled enough times.

Confidence is persuasive until it has been wrong a few times. After that people start listening for precision instead, for the caveats, the sourcing, the acknowledgment of what is not known. Certainty stops being reassuring and starts being a warning sign. That shift is what experience does to an audience.

Say what you know, say how you know it, and mark the parts you are unsure of. It feels weaker in the moment and it is considerably more convincing to anyone who has been burned. Precision outlasts assurance.