The reason I choose to call the eightfold path an advanced teaching is that, while the definitions of each of the practices are relatively easy to teach and understand, their full application and integration takes a lifetime.
Whether it is the internal or external sense of being "maxed out," what is often helpful is to seek a larger landscape in which to hold one's experience. This is not only a skillful means of coping with difficulty, but it is also an aspect of mindfulness and awareness.
In the Tibetan Buddhist tradition, according to the Dalai Lama, a person should closely observe a teacher for three years before consenting to be his/her student. It takes that long, apparently, to clearly differentiate Mara from Buddha.
One of the core principles of Tibetan Buddhism is that all phenomena, all experience, is essentially free of enduring, sharply delineated characteristics. We have the potential to experience anything. And anything has the potential to arise within our experience.