1. Around what level will mana management become important?
Not likely until sometime into Cata levels, unless you find yourself in a *spectactulalry* awful group. Like, *really* spectacularly awful. However, you'll also find as you get into BC dungeons that things *occasionally* get hairy as DKs start hitting 5mans. Those fresh DKs often have next to zero idea how to play a DK as they exit the DK starting area, and usually have also never tanked on any other toon before too, so they *can* make things a little... interesting for healers at that level.
Additionally, be aware that healing specs *often* change every patch. While this usually only affects the class at/near max level, occasionally the changes Blizz made do affect lower level healing a bit too. It's worth mentioning that you should come check out what's going on with your priest after a patch in case there's something you need to know ;)
07/10/2013 06:12 AM2. How do I deal with "That Guy" who tried to tank off the tank? He ran away from the group and when he died, decided to attack me about my poor healing.
Posted by Wilough
My advice is to beat "That Guy" to the punch.
What I mean is when you zone in, before the first pull, tell the group "Hey guys, I'm going to be sticking like glue to the tank. Keep up with the tank, because if you're out of range or out of line of sight, I won't be able to heal you!"
Then it's on That Guy's own head if he goes off to do his own thing. *Refuse* to leave the tank, no matter what.
07/10/2013 06:12 AM3. I'm kind of lost on whether I should stay Holy, or switch to Disc.
Posted by Wilough
Either is perfectly viable for leveling as well as for end game (I'm a Disc priest at heart; have one that I still get to raid on occasionally, as well as a number that I'm leveling on different realms)
Both can contribute some dps to the group when healing requirements are minimal; the difference is that with Disc, you're always *healing* while you're dps'ing so can mean you aren't as likely to be slow on the uptake if people start taking damage. Until you hit Cata, there will actually be very few circumstances where you actually have to *heal* beyond dps'ing-to-heal, as Disc (once you get Atonement anyway).
07/10/2013 06:12 AMOverall I really enjoyed my first experience aside from the one jerk, but I want to make sure that I am as well informed as possible so I don't ruin the game for anyone else. Any tips or advice would be greatly appreciated. Thought it may be a little early in the process, I do believe that I have a new level of appreciation for those of you who do this full-time.
Posted by Wilough
If you stay true to this statement, you will already be one of the better healers out there. A considerable part of being a "good" healer is staying up-to-date with how healing changes from level to level and from patch to patch. Once you're in the habit of *staying* up-to-date with the class you've chosen, the rest falls into place with practice.
A last very important point to make is that no matter how low-level you are, and no matter what class of healer you choose to play, start using your cooldowns as soon as you get them. It'll be very difficult to start remembering to use them later. They may not be needed for all the times you get a decent group, but use them every run anyway. Archangel, Pain Suppression, PW:B, talents like Power Infusion and Void Shift... USE THEM or you'll never develop the muscle memory & the instinct to hit the button when the sh!t hits the fan.
Have fun, and never hesitate to ask more questions!