There’s a book “Never Split the Difference” by Chris Voss that will get you up to speed. His videos on YouTube are also potent.

Ideally, you want to avoid the “I brought this” style of language; what else is someone to do than think, “well I brought this, too!” It gets especially tense if the evidence is too damming, so the protection mechanisms kick over rather than the empathy and cooperation channels.

Good luck - you got this