You won't ever know if it is "it" before after it's become "it".
Before success, anything is a calculated risk, and the success depends as much on your hard work and dedication and BELIEF in the idea, as it does in whether that belief is actually correct, and, since no one has done it before, it is unknown.
Comfortable life is whatever makes you comfortable, be it working hard on something you want to try, or working at a company and be relatively certain of a good income.
Ideas are great but can you make it a product that someone is willing to pay for?
Lean startup methodologies might be useful in that regard.
As for the comfortable life - if that’s your goal then don’t do startups. You’ll quit 9-5 to work 24/7 with no guarantee… you only hear about those who crossed the chasm, it’s a selection bias that make most people have romanticized view of startups.
Evidence suggests that each paper, project, startup, etc. is a lottery ticket you purchase with your time and effort. The more times you buy these tickets, the more likely, in aggregate, you are to succeed.
Evidence also suggests that careful contemplating (and getting competent feedback) what worked/didn't work, can help your next ticket be slightly more lucky than the last as you build new skills.
Before success, anything is a calculated risk, and the success depends as much on your hard work and dedication and BELIEF in the idea, as it does in whether that belief is actually correct, and, since no one has done it before, it is unknown.
Comfortable life is whatever makes you comfortable, be it working hard on something you want to try, or working at a company and be relatively certain of a good income.