This is the milestone people skip, and skipping it is the most expensive mistake in this class.
It goes like this: someone has an idea, spends four hundred dollars on equipment and a logo, prints flyers, and then finds out that the people around them do not want it, or will not pay that much, or already have someone. The money is gone and so is the confidence.
Five conversations would have told them. Five conversations cost nothing.
Five people who are not your family. Family lies to you kindly. You need people who would actually be the customer: neighbours, people at church who are not close friends, someone at the laundromat, the person whose lawn you pass every day.
If you cannot find five people who might want this, that is itself the answer, and it is better to learn it now.
Keep it short and do not sell. You are not asking them to buy today. You are asking what is true.
"I am thinking about starting something and I want an honest opinion, not a nice one. I would do [the specific thing]. Is that something you would ever pay for?"
Then be quiet and let them answer.
"That sounds great, good luck" is a no. People are kind and they do not want to discourage you.
A real yes sounds like: "How much?" "When could you come?" "Can you do my mother's too?" A real yes asks a question back.
Write down what they actually said, in their words, not your summary of it. You will use those words on your flyer later, and you will need them when you set your price.
Then you saved four hundred dollars and you found out in a week. Ask the last question: "What would you pay someone to do?" Very often the business is sitting right there in their answer, one step away from what you first thought of.
Tell the coach who you talked to and what they said — the actual words. It will not mark this milestone from a summary, and it should not. Evidence is the point.