The space between instinct and fear

I've recently been deciding whether to join a coach training program. As I mentioned a few weeks ago, I'm interested in finding a new way to support people, and excited to learn the techniques. I'm deciding between two programs, and find myself leaning towards a "no" for one of them. But, the more I think about it, I have a hard time determining whether it is a no from my heart or a no from my ego. Is it a no out of fear or a no out of knowing? I've been trying to tune in to truly understand the difference, and am pretty sure it is a no from my heart, but how do we ever truly know?