"I saw the angel in the marble and carved until I set him free." — Michelangelo
As an entrepreneur, you are also an artist. Michelangelo had knowledge and skill, both from studying and experience. You have your own capabilities also from studying and doing, gaining experience.
Just like Michelangelo, you have a vision you want to set free in the world, and similarly, you need to carve and find your angel in the marble.
Chiseling at your marble is all the things you need to clear up for your idea to become real. All the tasks you need to perform so that what started as a vision in your mind will become a real thing - a product or service.
You have one advantage over Michelangelo in finding your angel in the marble. You don't have to start by chipping at things and eliminating them as they come. You can see through your marble and view the angel inside, even before you start.
You can clear all that clutters your vision, what is not essential, and may prevent you from seeing your angel - your idea.
You can't predict all the pieces you need to chip away to get to your goal, but many are already visible.
Find the essence of your idea, and you'll be able to discard many things in advance, without spending time and money, simply by using your mind.