Is anyone a professional gardener? Changed career?

I have been following my Grandfather and Father around all my life learning about plants and I still don't know alot more than I know. My customers are always catching me out with questions about plants which I am not familiar with. What I always say is I don't know but I will find out. Its much better than trying to bluff your way through it. No one expects you to know eveything and in my opinion any one who describes themselves as an expert is usually just a big head.