Prototyping for user journeys can be done in various stages and levels of fidelity, depending on your goals and resources. To get started, define your user journey goals and scope, sketch out a map of the user journey, choose a prototyping method and tool, build the prototype, test it with users or peers to gather feedback, and iterate and improve the prototype based on the results. When defining your goals and scope, consider the objectives of your product or service, who your target users are, their needs and pain points, as well as how you measure success. For sketching out the user journey map, include the context, touchpoints, channels, and interactions that users have with your product or service. When selecting a prototyping method and tool, consider which one suits your needs and resources best; for example, paper sketches, digital wireframes, mockups or interactive prototypes using tools such as Figma or Adobe XD. For testing the prototype, use different methods such as usability testing or user interviews to measure effectiveness, efficiency, and satisfaction. Additionally, use techniques such as A/B testing or multivariate testing to compare and optimize different versions of the user journey. With this process you can reach an optimal level of user journey quality and performance.