In photography you will make mistakes. Most of times it will be frustrating. This will happen to most photographers as they continue their journey. But over time these frustrations and mistakes will become lessons that will make you only better. And every so often these mistakes will be happy mistakes that add to the photograph.
The key to getting to this point is NOT TO GIVE UP. As a photographer you have to work through the mistakes and the process that comes along with it. And that is what mistakes are, they are part of the process. You have to learn to love the process. When you master this mistakes will not have the negative connotation that it has to a lot of photographers.
So go out there take photos, make mistakes, and most importantly learn from them. From that you will make progress in your photography.