So, after I (very kindly, I thought!) wrote the post on "how to rip jeans", Hannah finally did her pair! The results can be seen below. I think she did a very good job too.
She told me earlier, "I used a grater as sand paper wasn't strong enough. I am very happy with the results! I didn't do them too much as I know they'll get worse the more I wear and wash them!"
Thanks for letting us know how you go on, Han!