Its pretty simple now. There are 5 time extension (TE) mobs. You have to run all over hells half acre and kill them first. After defeating the TE mobs you find a place to pull mobs to. There are 3 ways to proc mobs - Weaponskills, Job Abilities, Magic -
All casters mobs are proc'd by magic. (BLM, WHM, SMN, BRD, RDM)
Weaponskills proc (PLD, WAR, SAM, DRG, DRK)
Job Abilities proc (RNG, THF, MNK, BST, NIN)
Thats the simplest run down I can give. OH.... and ALWAYS HAVE RR UP. Invest in earrings or something!