A few general arena healing strategies and tips

Found this post, its a bit old now but still relevant i think. Gives a few good tips on Arenas and healing just a few general points.

With my 2v2 team finally breaking 2000 rating, it's time for me to take stock of my experiences in arenas, and look to see how I can improve myself to push myself (and my team) to the next level.

While my experience is mainly in 2v2, I have done enough 3v3s and 5v5s to get used to the dynamic, though I would hardly count any of those teams I have to be successful (yet, anyway).

So, here are just a few of the things I've learnt, both in generic terms, and as they relate to my class, the priest.

Generic Healing Tips
POSITION POSITION POSITION
It is vital as a healer to watch where you're standing, I think more so than any other class/role. Hug pillars and constantly move in and out of line-of-sight of your opponents. Not only will this help you with ranged classes, but for melee classes, it has the potential to put the rogue/warrior/etc. who's attacking you out of line-of-sight of his/her healer. Nagrand is obviously best for this, as you can just kite around a pillar. You might want to change directions and head for another pillar after dropping a successful fear, but do this only if you know with certainty that you can make it there (don't try it if there's a hunter, for example). In the Ruins of Lordaeron, run around the tomb in the center, realizing that the four corners are deadzones for anyone standing on the tomb itself. In blades edge, the pillars at the bottom of the bridge are decent to work with (but realize that they aren't entirely circular, so it's harder to hug them). Also, the two small pillars on either side of the entrance to the bridge section (on top) are good deadzones to abuse. If nothing else, running up the ramp and jumping off the bridge is a good kiting tactic.

Bait Spell Lockouts/Interrupts
Even classes (like priests and druids) that have the ability to heal without ever casting should consider drawing silences/interrupts/etc. You want your opponents to spend their cooldowns at a point when you're still comfortable with your health (or your teammate's health). For druids and priests, getting a healing school lockout will allow you to get mind control or cyclone on one of your opponents.

Priest Tips
Mind Control
Use it. As described above, bait a school lockout by casting a heal, and use that opportunity to mind control your melee opponent. If nothing else, it will force them to burn their trinket cooldown (which then allows you to get a fear off). Blades edge is especially good for this: stand on the bridge, and mind control your opponent off, buying you priceless time.

Use your Trinket on Snares
It may seem obvious, but you shouldn't just save your trinket for true CCs (sheep/trap/etc.). A well timed trinket can help you gain some distance on your opponents, allowing you to survive for just that much longer.

Offensive Dispelling
This is something I always forget to do, but something that can turn the tide of the battle. Basically, if you're not healing, you should be dispelling your opponents.

Run and Heal
Where possible, I try to always have a finger on one of my movement keys. With prayer of mending, renew and power word: shield, we have 3 great instant cast healing spells. In a good game, these are the only healing spells you'll use. Continously refresh them on all your teammates, and keep running around while you're at it.

Source.