As a huge Harry Potter old lady, you are forgiven for not reading the books, etc!
I have read or listened to them over 20 times each and for some reason never get tired of them. lol I also have all the movies on DVD.
The scarf really looks terrific!! Have you thought about using your circs as straight needles? I never, ever knit with straight needles anymore. For one thing, the circs hold the weight of whatever I am knitting so much better than a straight needle does. It is pretty easy, you just cast on, knit the row and turn and come back starting with the last stitch on the first row instead of coming to the end and then knitting into the first stitch again so that it is a circle.
Looking forward to seeing the finished product! Is is for you or someone else???