Great question, aqua03!
To be honest, I didn't have confidence at all when I first started publishing on Tapas. I kept telling myself "The story's not finished. I'm still unsure how it will all end. I need to work on the lore more."
And that was my problem -- I was so much of a perfectionist that I kept myself from the most crucial aspect of artistry, which was to take a dang step forward.
We live in a wonderful era for the arts, especially for writing and illustrating, because we can publish an amiable product. True art is like a living being: it always changes and is improved upon. So we have the freedom to go ahead and publish, even if we may not have all of our shit together. Having that support system of readers behind your back truly becomes your main drive as you push forward to finish your story.
So do I know how my story will end? I got an idea, but only time will tell. In the meantime, allow the readers to enjoy the ride along with you, because storytelling is all about the journey, anyhow.
And if you ever need to go back and edit a page or two, go right on ahead! It will only make your storytelling that much stronger.