Wow Healing Tips Pt.1

As a healer, you may be a Priest, a Paladin, a Shaman or a Druid. To heal is your main job.
However, as a healer, one soon learns that sacrifices neither need to be made, because mana is not infinite, nor are our heals all instant-cast with huge instant hits.
And sometimes as a reward for our healing, we get group-attacked by monsters if things aren't going right accordingly.
When it comes to deciding who to let die and who to focus on making sure lives, there is no difference between dungeon healing and raid healing in this particular instance.
Someone has a forum signature which is an awesome rule of thumb for a healer even though it doesn't go into great detail nor does it cover all healing scenarios:
If the tank dies, it's the healer's fault. If the healer dies, it's the tank's fault. If the DPS dies, it's their damned fault.
It's no doubt that many DPS don't like this statement, because they figure it's the healer's job to heal them, but there's important information they're missing when they get upset.
It the tanks dies, it's the healer's fault. In a nutshell, the tank is the healer's main priority in a group setting, because at certain levels, if the tank dies, then the whole party is doomed to die very quickly afterwards.
In low level instances, the tank isn't really as important as they are at higher levels, but that's also reflected in the smaller amount of healing the entire group will require in low level instances. These low levels are meant to be extremely forgiving while people are just starting to learn how to play their class, which is why it's good for a healer to jump into PUG dungeon runs before hitting Outland levels.
Having a specific person performing tanking duties helps coordinate the efforts of the team and the concentration of the healer must improve from pre-Outland levels as well once you get to Outland instances. This is where DPS players have to start improving their game as well, instead of relying on the healer to save their ass every time they pull aggro.
At this Outland point, healers will begin to feel more pressure from DPS who haven't learned how to control their aggro - it's funny how some dead DPS think it beneficial to be demanding on the healer while the fight is going on, asking why they didn't get any heals in a chaotic situation.
If the healer dies, it's the tank's fault. We learn early in our dungeon running to work together as a more cohesive unit than what we worry about with the DPS, and over time and with practice, we get pretty good at it.
Like the tank, if the healer dies, unless there's a backup healer to pick up the slack, the rest of the party is generally doomed to death as well.
Depending on when the healer died and how many mobs were left and what level of dungeon you're in, this isn't always true.
Making sure that the healer is defended and watched over more than anyone else in the group is one of the tank's responsibilities. This is the reason that the healer is so critical for the tank's own survival.
A good tank gets to the point where taunting the attention of a mob off of a healer or a DPS becomes second nature, and therefore DPS who mistakenly pull aggro once in a while don't get their faces bashed in each time.