I bet of all the steps in Sorry Sorry you've tried, tutting would be the HARDEST part. It is hard, but its possible to achieve. I've studied the tut and could do it after 2 days
with all the unnecessary focus on it when I should study my books. So here is one good tutting tutorial of Super Junior that I've found.
Credits to PungPhooie
For people in their teens, you can still achieve that super jelly moves like Eunhyuk to do that perfect popping and waving. And no comment on SungTeukEunHae footworks! That needs some serious practice to achieve fast moving legs like that. I FAIL on that everytime I tried!!
I wish you all the best, do tell me if you're going to get your nerves on with that contest. Wanna see how sick your moves could be :) Kamsahamnida