The first step that the business analyst should take before starting UAT is to identify power users. Power users are users who have extensive knowledge and experience with using Salesforce, and can provide valuable feedback and insights during UAT. Power users can help to write, review, and execute UAT scenarios, as well as train and support other users during UAT. Power users can also act as champions for change management, and help to promote adoption and satisfaction with the solution. The business analyst should identify power users from different roles, teams, or regions, depending on the scope and scale of the project. The business analyst should also communicate with power users about their expectations, responsibilities, and availability for UAT.