Lots of niche options

I have a handful of niches that fit well in the niche worksheet requirements.  Some of them I think I could start serving well immediately, and others I think I could grow into serving.  Some I think would scale well, others I think would help me get experience before focusing on a niche that I could charge a higher price for my offerings.

I felt pretty good about one, but then as I think more about my skill sets, my interests, personal story, etc. I find myself wanting to change my mind before testing one.  Which then triggers the thought: focus on a broad, general market.

What’s happening is that as soon as I decide, my brain offers me a bunch of reasons for why I might want to re-decide.

How do I coach myself through that?