It doesn't matter how good the idea is it's the execution, so don't worry about people as they won't have the passion you do.
Just remember #JamesClear, #AtomicHabits, "just start" where you are with what you have. You can't optimise what doesn't exist. And, **never** put money upfront (like in a course etc) but do put money **in-process** when you are actually doing the thing.
Fact is, your original idea will morphe into something totally different that you wouldn't have expected by just thinking about it. Which is good.
Don't take leaps of faith. Small gains and daily progress: easy come, easy go. Hard come, hard go.