Starting a new painting-painful today

I woke up at 2 am this morning and could not get back to sleep so I got up at 2:45 to start on a new painting.  I have been looking at this design I drew on canvas ( I will post the picture next time) for a week and have been unsure as to what to do with it.  This morning I just put a color on the palette and started on a section.  It was  painful as I was uncertain what was going to come out, not quite sure what to do.  By the end of that section, which took an hour and forty five minutes, I just gave in and allowed what needed to come out flow on the canvas.