1) Communicate with your group. Decide who is healing the main tank, who is healing raid, if you have more than one BRD coordinate songs with Battle Voice to get the most bang for your buck.
2) You don't even need a LB to beat Titan, so decide which LB and when is best for you group composition.
3) You don't need to stand entirely out of the Landslides in order to not get hit. You just need to be past the blank squiggly lines. (Gives people more space in Phase 5 during bombs+Landslide).
4) STACK for Stomps (easier healing for your healers) and DISPERSE for Plumes. Note: If you spread out as the plumes spawn in phase 5 the plumes will be closer together, which means yes if someone gets hit they WILL die, BUT you have more safe places to stand as opposed to trying to hide in a little triangle at the edge of the arena.
5) In Phase 5 when the GRID formation bombs spawn STACK on the middle bomb of the last row that spawns. Strafe/Side step out of the Landslide (assuming it's near you and remember the tip about Landslide). As the animation for the Landslide finishes, run into the centre of the arena. You will never get killed by these bombs using this strategy.
6) In Phase 5 when he puts someone in the Granite rock. Take a deep breath.

It helps if you're the type to get nervous.
7) Practice. If you realize you could be holding a group back due to not being able to dodge, thank them for the experience and gracefully leave. You WILL find another group to do it with and you WILL get better at it. Don't get discouraged.
8) Remember to have fun.