Immersion means 100% focus. If possible, no friends, no drinking, no TV, just reading and writing code. If you take five minutes off to read the news, be aware you are breaking the mental state of immersion. Stay focused, be patient, your mind will adapt. Eliminate all distractions, of which you may find doubt to be the loudest. Immersion is the difference between success and failure.
Even after all our research, we missed an important truth about how the world has changed: The way people access a tool is just as important as what the tool does. People are overloaded with information, logins, and interfaces. And here we were, asking them to create a whole new habit.