I’m very new to offering financial planning and even newer to Values-Based Financial Planning™, how should I answer the question, “How do I know that you can deliver what you are promising?”

That's not the kind of direct question you're likely to get. More typically, they will ask you questions about how you do what you do and, at some point, they will either take the leap of faith and hire you... or not. All decisions are to some degree a leap of faith because it's hard to pre-determine the outcome of any decision. It is important that you are able to answer questions about what you do and how you do it with confidence and conviction. People regularly make their decisions as much by how you answer the question as the substance of the answer.