Proper CC Pulling Procedures
First we will cover each class and which forms of CC they have available.
Druid - Hybrinate, Entangling Roots
Hunter - Freezing Trap, Wyvern Sting
Mage - Polymorph
Paladin - Repentence
Priest - Shackle Undead, Mind Control
Shaman - Hex
Warlock - Fear (Glyphed), Banish, Seduction, Enslave Demon
With the exception of Freezing Trap none of these require special positioning. That being said I am going to focus on Freezing trap because time and time again I see pulls getting fucked up because nobody knows what they are doing.
The main problem is that of coordination, someone will pull as the hunter is trapping so the mob has already moved off the intended location and you are left with an extra guy sitting around. This is particularly bad due to the extra mob getting tanked and usually ending up with dots making it unable to be cced.
There are two methods to use Freezing Trap; the first is to allow the hunter to through the trap down on the necessary mob and then to cast your other CC or pull the remaining. The second method is for the hunter to place a freezing trap off to the side and then Distracting Shot the mob (assuming it's some sort of melee, if it is a caster then silence or LoS will be required) to bring it onto the Freezing Trap.
Be mindful of the CC's and how they work, especially the Freezing Trap. Setup a CC order ahead of time to minimize your failures.