The same coworker let me "borrow" her hair to try the rope braid on again.
I think I got a better hang of the technique this time. It felt a lot easier. I guess I just have to keep practicing until my muscle memory has a better grip on it.
Putting the ends up in a bun helped keep the shape a lot cleaner, but the bun itself was difficult to form because she doesn't have a lot of length to work on.
A few more tries and I think I can attempt doing my own hair. Hmm.