Reaching Jhana, where the appearance of Nimita usually happens in the second, is definitly doable with constant daily practice and a structured roadmap, such as "The Mind Illuminated" is providing.

But before this can happen, one needs to go through several stages beforehand, because otherwise the mind is too disturbed to reach access-concentration which is the foundation of any flow state.

TMI provides all the necessary roadwork that has to be done beforehand. For me it's the best meditation book available right now.