Titan HM is not hard. The hardest part is finding 7 other people that are competent enough to complete it.

My best advice level BLM and do the primals. You will learn ever pattern. Why? Because if you want to do any damage you will need to know when to stand to get a couple extra casts off. For example, In Ultima HM, The first set of plumes is outer then inner, so you prep by standing in first. The 2nd set is inner outer, however, there is a special spots on the outside where you can tottaly avoid the plumes by standing in, thus allowing you to cast uninterrupted.