Perfecting my flat twists

I had today off from work so I have been playing around with my hair while I was lazing around on the couch. I really want to get my flat twist technique down, because I want to be able to do this style:

I think I've got it down, I just have to practice more. I would love to be able to do it for when I go on vacation in 9 days, but knowing me, that's not going to happen. I would just love not to have to fool with my hair for a few days. Maybe I can talk one of my friends into doing it for me :-)