I have just read an essay entitled Photography is Easy, Photography is Difficult by Paul Graham, it was written for the Yale MFA photography graduation book. I think this short piece of writing captures the doubts and excitement that exist inside me as a photographer (in a varied, shifting balance), the questions, the worries, the rushes of joy, belief and creativity.
as Paul Graham writes (about making a photographic body of work):
Then one day it will be complete enough to believe it is finished. Made. Existing. Done. And in its own way: a contribution, and all that effort and frustration and time and money will fall away.