Starting from the scratch,
should not cause worries.
And that's not because you can always look things up in your textbook later; it's because the “usual solutions” are not conducive to most of our projects. And admittedly, because we love to think outside the box, strain our brains and come up with daring perspectives. Things that no one else has ever thought of before. Or done. At the end of the day we want to deliver our best —and be able to look our customer in the eye.