It is very easy to do. Hem the skirt first, and then you hem it again with the fishing line rolled under the hem. I don't have a serger, I use the sewing machine, with the same settings as a regular hem. Make sure you use fishing line with 20-30 lbs, and not the thin ones.
Also make sure you leave enough length. After you leave your skirt to hang for a couple of weeks, trim it to your height, but don't cut it exactly. Leave a few inches, because hemming with the fishing line will pull the edges up, so you could end up with a skirt too short, that cannot be fixed.
Marianna
www.marianna.cc