How to have certainty without attachment?

I’ve heard almost every coach that I consider successful says that certainty in the outcome is a fundamental key to achieving it. And I love that. When I feel certain, for me it’s a sense of confidence and calm and determination. It’s a great energy to be in. But I find my certainty model sometimes comes with a side helping of attachment to the outcome that is desperate and graspy. The model on that leads me to lacking thoughts such as “I don’t have enough time or resources”, “I don’t have enough clients”, and “I’m not a good enough.” How can you have certainty in an outcome without the attachment of *needing* it? Thank you 🙂