Well, for starters, I’m not sure what failure really is. I’m always experimenting and learning and, to me, what others may perceive as failure is really just an indication that something can be improved. I am always looking for ways to improve things, and constantly analyzing things for weaknesses.
Developing a solid design on paper (or in CAD) is exceedingly difficult, and perhaps impossible. For that reason, many designers, after they have put together a workable idea, create a 3D prototype that they can interact with, test it, and understand ways to make it better.
In almost all cases, there will be a desire to change something. Maybe it doesn’t look or feel right, or maybe it doesn’t operate as it should. These are not failures, but merely a part of the process.
This same mentality can be applied to the work that we woodworkers do. If I make a three legged stool, I might realize, when I test it, that the legs are too close together so it is easier to tip over than I might like. This isn’t a failure – it’s just a step in the design process. Next time I make something similar, whether it be the next day or next decade, I will take into consideration what I learned from the previous versions of the design and make adjustments.
I guess what I am saying is that creating good products requires patience. Developing a good design requires caring and often requires numerous versions, each a little more refined than the last. Quality workmanship takes an investment in time. And it takes time to fully understand a design – the best way I know is to use it in everyday life just as you normally would.