How do you create a customer journey map in UX?

Set a goal, conduct proper research (less guessing, more customer interviews), build user/buyer/you-name-it personas, create a map (or two-five-many if you're going to target more than one persona) based on your persona’s journey and make sure to update the document(s) regularly. Sounds easy but we wouldn't write so many articles and guides (https://bit.ly/3HkzsWK) for journey mappers if everything was as simple as two and two.