For what it’s worth, I suffered through a 9-hour deposition last year on a civil case with high-dollar NY lawyers. Ms Mills went through days of training in advance of her depo. I was taught to pause 2-3 seconds before answering anything to give my lawyer a chance to object. “I don’t know” is a good answer so long as it’s consistent throughout your testimony. I was under oath, on video, with a transcriber and 4 lawyers in the room.