re: Becoming a professional woodworking or not

The common mistake many small business owners make is related to money management.

You need to treat your business as if you are an employee of the business.
Pay yourself a reasonable salary. Don’t treat your “cash register” as an extension of your pocket.
By paying yourself a salary, you will accumulate extra funds for when business is slow. Don’t run to the dealership and buy that 4×4 when money is coming in.

beware of financing deal. They are attractive and they do free money to spend on other stuff. They are somewhat tax deductible and that make them attractive.
Tax deductible does not mean free. Do remember you still pay quite a bit from your pocket.One should not indulge in unneeded stuff.

Most importantly keep regular business hours. Your customers will have a feeling you are reliable. And yes, treat them the way you want to be treated.