Heck yes. When I was still in corporate America, I trained people all over the country in business development and sales, and I always taught people that it’s okay to say you don’t know something!
In fact, you garner a lot more respect when you say you don’t know something but can find out than you do if you were to give a crappy answer or bad information and they find THAT out. You don’t want to ever be seen as dishonest or not trustworthy.
People seem to think they have to know everything to be an expert, but a real expert is someone who KNOWS they don’t know everything but can find out the right answer.
Never BS your clients! It’s okay to not know everything!
I’ve been freelancing for full-time over a year and a half now, and my clients have definitely heard me say, “You know, I’m not sure. Let me find out and I’ll get back to you.”
It is the hallmark of a smart person when they understand and accept they don’t know everything — and they don’t have to to be successful.