The downside of metalsmithing and making jewelry, is that sometimes it doesn't work the way you think it will. For instance, last week, I made two wonderful commissions, and sent them off to their new homes. One broke en route, and the other was the wrong size. Things must be re-done and reconsidered. It can be frustrating, but mostly in the sense of "what did I do wrong?"
Luckily, being a metalsmith and designer has helped me become a fantastic problem solver, who often thinks "outside the box". I often surprise myself with knowledge and ideas that I didn't know I had stored inside me. Not only that, but innovations to new problems.