Yes. I get frustrated. There have been many times I've wanted to throw my oboe. It doesn't help that it's shaped like a javelin and would probably look great flying through a window.
Those feeling of frustration can be demoralizing, i try to put it in the proper context. It's crucial to recognize that the frustration is a sure sign i'm improving. In general I've found that my ears are faster than my body. I develop a concept of how I want something long before I'm able to execute it in my playing.
Figuring out how to get from point a to point b can be a very difficult process. As a professional, I've developed a lot of strategies and techniques to move forward. I've been fortunate to have teachers who have guided me through the process. I still have those frustrating moments, but I'm better equipped to work through them.
I really think thiis is one of the most valuable lessons kids can learn from playing an instrument. Through her violin, my niece is learning that something very challenging can also be very rewarding. She's learning to have patience and that improvment is a long slow process.
A couple of weeks ago, she performed in public by herself for the very first time. She was so excited about it and I could tell that she was really proud of herself. It was a payoff moment. Those moments are what make it all worthwhile.