There's no way to put a limit on what one may accomplish individually if the intent is an impeccable intent. Don Juan's teachings are not spiritual. I repeat this because the question has come to the surface over and over. The idea of spirituality doesn't fit with the iron discipline of a warrior. The most important thing for a shaman like don Juan is the idea of pragmatism.

A rule of thumb for a warrior is that he makes his decisions so carefully that nothing that may happen as a result of them can surprise him, much less drain his power.

If you were a warrior, you would know that the worst thing one can do is confront human beings directly.

A warrior never worries about his fear.

Crows are not always available to give warning.

The spirit of a warrior is not geared to indulging and complaining, nor is it geared to winning or losing. The spirit of a warrior is geared only to struggle, and every struggle is a warrior's last battle on earth. Thus the outcome matters very little to him. In his last battle on earth a warrior lets his spirit flow free and clear. And as he wages his battle, knowing that his intent is impeccable, a warrior laughs and laughs.

A warrior considers himself already dead, so there is nothing to lose. The worst has already happened to him, therefore he's clear and calm; judging him by his acts or by his words, one would never suspect that he has witnessed everything.