What's your fallback plan?
Have you a business plan?
Have you at least 6 months operating funds on hand?
Also is it a service that is in demand?
From your question you apparently haven't done your market research so my opinion it plan to fail. My questions above are based on personal experience, business is tough and it's about cash flow. Though I'm now an auditor by trade, my education is an MBA-Finance and I'll tell you it's all about money, without it nothing happens.
Asking folks here might help, but how many have 40 years in small business to fall back on? Very few I'd suppose as nearly everyone is employed by someone else in a manufacturing setting, whereas myself and very few others are individual business owner/operators.
Recommendations - Do some market research. Reach out to the SBA and see if they have data in the area. Check your local/regional Chamber of Commerce. Don't quit your day job!