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If you have prior experience in the field then you should know people in the industry. If your field requires credentials you probably have the knowledge. If you don’t have the background then surround yourself with people in the industry as quickly as possible. Join every group you can that has people in the field. Ask them questions and if a good fit you could partner with them. Being out of a field for 20 years is not a prohibition but can become your field. Read everything you can about the business. Have partners that complement you and you can succeed!