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Write it anyway. Most authors have to write a few books before they publish one. Don't think your idea is going to be your one and only idea ever. Some of my published work I have rewritten entire ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/29825 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/29825 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Write it anyway. Most authors have to write a few books before they publish one. Don't think your idea is going to be your one and only idea ever. Some of my published work I have rewritten entire large set-piece scenes over THIRTY times before I liked them. So you might as well get the first draft out of the way; or at least write your big scenes, if you can write out of order (I do, all the time). Actually writing it out is a way to "debug" your story and see if you have problems to solve. I often think of this as writing something awful that needs to be fixed! Or I sit down at the keyboard and tell myself, _"Okay, let's fail at writing this confrontation."_ Then afterwards, _"Yep, that blows. What is the worst thing wrong with it?"_ That may sound weird but it works for me; and it might work for you. Take the pressure off; you aren't writing a masterpiece, you just need something that gives you a direction for research and refinement.