Hi David:
I am not, but believe that I can. Therefore, I will not say that I cannot, and neither should anyone else.
This line of relationship within ourselves is important for everyone, as it is an essential constituent of bhakti. As we all know, bhakti is the primary engine of yoga. It is the part of us that believes, and belief is essential for us to take that next step on our path, however small or large it may be.
At the same time, as we engage in the practices of deep meditation, spinal breathing, samyama, etc., this line of internal relationship (bhakti) arises naturally, and we will no longer doubt our potential, regardless of the externals. Anything becomes possible, and the externals become all but irrelevant in the face of the steadily increasing divine outpouring. Our good intentions will manifest one way or another. How is not for us to judge…
To favor the external over the internal is a kind of mytholization that will hold us back. Isn’t it obvious? Thank goodness practices will take care of it in time, so we don’t have to be endlessly wrestling with our beliefs and thought patterns. Of course, we will anyway, for a while anyway. Eventually it all goes to stillness, and then we know…
Believe!
Miracles do happen (constantly) for those who believe. With respect to what we can accomplish, the word “cannot” is completely irrelevant.
The only problem with mythologizing in my opinion is that it is most often pointed in the wrong direction, externally toward others, which saps our ability to fully express our innate potential. We should be pointing it inward, and using it as inspiration for our practice.
This is the essential point in the great myths – not to mythologize the hero as an external phenomenon, but to inspire the hero within us all. So often this point is missed. It is also a failing in the guru system. No one is to blame. It is our inner obstructions. Now we are catching on as inner silence and the light of knowledge are rising.
We ordinary folks are full with extraordinary possibilities. Let’s never forget that. 
The guru is in you.