Just back in the office after a day in the woodshop.  There are no end of ways to 'fail' when making something, and each time I discover one, it is a new lesson.  I was actually talking about this with the guy who mentors me, and I compared it to a time in my life when I took a train to work.  You can get to the train with lots of time to spare, or only a second, but no matter what, you have always 'succeeded'.  The only way to really know what it means to miss a train is to be standing on the platform watching it roll away.  Then you completely understand 'success' and 'failure'.  Until then, they are only concepts.