If you can learn something from a mistake then it becomes a valuable experience. Three things I have learned today.
1. Design your patter first, even if you think you can make it without one, make one anyway.
2. Left and right sides are not interchangeable, double check before you sew.
3. I don't like seam tape.
The bottom line is if you persevere something good will result. I ended up with three of the cutest notebook covers. The end results are some pretty fabric covers for 3/4" binders.