I try my best to(and think I do pretty well to some degree) practise this very idea. I am a recent non-technical grad and have been trying my best to add value to a start-up I reached out to. The one thing that I have found to be my best attribute is owning a project I know I can do well. I present an idea, say how I will accomplish it, and execute. The thing I am battling at the moment is spending more time planning than executing. I spoke with a knowledgable friend once and he mentioned, especially in the start-up arena, that once you reach the point where you are 70% confident that an idea is a good one, you should execute right then. The energy and time involved in working on the remaining 30% confidence is simply too expensive for a start-up to afford. I now just need to take this to heart and practise it.