This is a little guide I put together to try to help some of my guildies that im trying to teach the instance too. This is not all my own work. I have just done some research and just put together useful information i've found from other fellow tera players that i thought could help my guildies and maybe some of you.
Debuff Timer: 2 minutes for HM, 3 minutes for NM
Debuff Rotation: 90% / 50% / 30% / 20%
Shield: 70% / 50% / 30% / 20%
YMCA: 50% / 30% / 20% (dont really kno what ymca means in this situation. but this is when the healer cleanses queen on the second buff he gets. dont let him get 3!!)
Queens debuff phase will start when the person with #1 debuff has 50 seconds left on it. ( That goes for hardmode )
MC NM is good to practice with new teams to get used to the cacoon phase and queens attacks and debuff rotation.
1st most common problem new people have is the debuff rotation. But i assure you this is not hard once you play the instance a few times and learn it
2nd most common id say would be the the donut. It seems to catch some people off guard alot. Just remember.... In'n'Out. (thats what a hamburgers..... all about) Oddly this helped me alot
3rd is hard maybe it should be the 2nd but the Curl people tend to find difficult. just relax and make use your cooldowns smart.
Most of the information i got from here are in these 2 videos below. It will help alot to watch them both.
In the end. You can read all the guides on the internet, and they may help. However, Practice makes perfect.This is a good video that will show you how the debuff rotation and queens attacks and attack animations
http://www.youtube.com/watch?v=aX3ulqqKD3wThis is a great video for MCHM. Explains almsot everything you will need to know for HM
http://www.youtube.com/watch?v=wqII1A-BY54