Myself. I tend to get in my own way. I, like everyone, have a million other things to do...kids, volunteering, soccer games (mine), triathlon training and countless other excuses. The truth is more likely that I am riddled with anxiety about whether or not the output would be good enough, and I am often hard pressed for inspiration. Finally, I am notoriously undisciplined and given to flights of fancy which distract me from the overall mission of completing much. That said, I have completed a novel that has been accepted by 2 publishers, though I am still seeking another that I think would be more respectable.