Generate a full detail guide on performing due diligence when acquiring a business. The guide must be a structured checklist for the acquiring party. It should include detailed sections covering: 1. Financial Due Diligence: A checklist for analyzing financial statements, tax returns, and cash flow. 2. Legal Due Diligence: A guide to reviewing contracts, corporate records, and intellectual property. 3. Operational Due Diligence: How to assess systems, processes, and the management team. 4. Customer Due Diligence: Strategies for analyzing customer concentration and satisfaction. Please include a very strong disclaimer that this process must be led by qualified legal and financial professionals.