How do I handle being expected to know every answer in front of customers?

You are the technical expert in the room, and yet you are still learning, and being expected to have every answer live in front of a customer is nerve-wracking. That fear is understandable. It feels like one 'I don't know' will shatter the whole picture of your credibility. But the belief underneath the fear is wrong. Real experts do not know everything; they know how to find out, and they are honest about the edges of what they know. Saying 'good question, let me confirm that and get back to you today' does not make you look weak. It makes you look trustworthy. It is the person who bluffs an answer who eventually gets caught and loses the room. So let go of the impossible standard of instant, total knowledge, because no one truly has it. Prepare well for what you can expect, and for the rest, get comfortable with the honest, confident pause. Customers trust someone who is straight with them far more than someone who is never wrong. Next time you are stumped, try the calm honest answer instead of scrambling. You will feel the pressure drop, and your credibility will rise, not fall.