I also agree that there's abit of a learning curve between the levels.
In my opinion level one is the most challenging. And it sets the stage for how later attunements flow and integrate.
Anecdotally, I can say that the Reiki people I respect the most for their adeptness at being the best Reiki channels that they can be .. understand that there is a passable but wide river of learning and experience to cross between attunement levels.
Namaste,
Michael
