Like everyone else has said, stack expertise and stack avoidance for Prince. Hopefully you've been putting together an avoidance set, and Prince is the perfect time to put it to use. Keep the Clap, Demo, and Commanding up at all times. Make absolutely certain that SB is back up as soon as the cooldown allows. Keeping SB up should be your number one priority.
Also, don't forget that your healers are a huge part of the equation. Find out how they're healing the encounter. Phase one and phase three can be healed reactively, but doing that for phase two is extremely dicey until you really start to outgear the encounter. Depending on your gear level, it may not be necessary to be totally spam-healed, but healing definitely needs to be proactive, and you need to be topped off at all times.
If you don't have Recount, get it. One of the things it's great for is looking at death logs and pinpointing exactly what went wrong. It will even graph it for you. It will make it very apparent where the problem lies.
Kazeyonoma: Giving people too much time to think makes them do stupid things too.