If you write a tutorial, don't cover up all the mistakes you made along the way. Include them in detail!
Reading a success story is nice, but as so often in life, you'll learn so much more from all the mistakes you make, and all the issues you run into... and so will your audience.
@fribbledom I could see this in a howto, but not in a tutorial. For a tutorial user, the project is likely to be dropped at the first stumbling point, and a deeper understanding is not the point of a tutorial.
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