Love the answers given so far. I'd add one more thing to your message to the brand.

"We offer a guarantee."

Make up a guarantee that will quell their fears, reassure them that they're not taking a big risk working with you. And remember, the guarantee does not have to be a 100% refund. There are lots of different types of guarantee - workmanship, timeliness, quality, expenses markups.

Go for it and enjoy the ride! I only started my agency 4 years ago and I'm loving it.