I was just thinking that maybe it was TOO hard a challenge as so far I've had few people try it out. Really you don't have to tuck things under - you can just go with placing under or on top but for those who can manage the tucking, then it adds the extra challenge to it. Once you get used to doing it - it becomes really easy.
Again if you aren't sure on how to do it - Check the tutorial out that I've linked to in my first post which shows you how to do it. Hugs.