Haha I dunno but its never been a problem for me. Lots of practice I guess, but even with no practice, the simple mechanics of the loop and hook never managed to elude me lol. I usually do it right handed while facing her, so the right hand goes around to the back, the thumb holds the loop part in place usually at the forefront of the reinforcement backing, then two or three of my other fingers usually just flick the hook off. If its being difficult, I just pinch it in between the long parts of my index and middle finger and pull... an extra second.

But like stinky mentioned, I enjoy waiting a while first and teasing... then unhooking it when she least suspects it, but not taking it off.. moving elsewhere so she forgets its even unhooked... hmmm I should probably just stop here lol. Its been a few months and will likely be even longer