Pending Aquamarine's return, here's a link to one video about European finished hem on jeans:
https://m.youtube.com/watch?v=5LTAjoPnWqM
Comments worth reading for further tips.
This works best on fairly straight legs, on hems that are OK done straight across. (Unlike Mr Max's hems, which look like a form of sculpture. He's not able to take advantage of included-with-purchase tailoring services, even at a high-end department store which shall remain nameless, because no matter how specific he was, the tailors think they know better and end up hemming straight across to shortest length. So he does his own.)