I just did one of the new 5 mans, and felt like a complete newb... "mana break", few trash, "mana break", few trash, "mana break omg sorry!". I felt way out of my element, and like such a newb. Luckily no one in the group were jerks about the deaths.
I'm perusing the latest fresh (Dec 3rd) Disc Priest thread on EJ, and there's some good info (the comments mostly). Perhaps you can find something there to help you, too.
http://elitistjerks.com/f77/t110244-...st_compendium/
On another note... there's some ok gear dropping for us, but are you worried about giving up the set bonuses? Half way through that instance, I put all of my tier/icc gear back on. I swear it felt like my heals weren't doing **** to the tanks health (tank is my boyfriend, so I'm extremely familiar with his health and how much my heals hit him for).
Any input?