Just starting out with heroics? Go to H-CoS

[Zzyzxx71]

You're preaching to the choir brother - unfortunately if you're experience is anything like mine those last 4-6 minutes will cause you to go bald with stress.

I've been seriously considering recording one of my timed COS runs to highlight the tricks I've learned.

A few from the hip suggestions (this is assuming you're running a shammy team, but typically I'm wrong when I assume..)

1. Thunderstorm whenever it's up. ALWAYS recall your totems when you move.
2. Thunderstorm whenever it's up. ALWAYS recall your totems when you move. (posted twice on purpose)
3. Always use buff food right before you talk to Arthas.
4. Only drink either before a boss if you're below 75% mana (and only to get yourself to 75%... the clock is ticking)
5. ALWAYS drink after the bosses, bind the same key for drinking to EATING on your tank.
6. After Salramm loot FAST and GO GO GO GO GO. If I have to go the WHOLE distance, I normally drop about 3 sets of totems along the way so it kills the zombies en route.
7. Do NOT talk to Arthas at the town hall until all the zombies are dead. The action of Arthas going into the town hall while you're under attack has been known to bug the event.
8. Once the town hall portion has been started, run to the BACK by the stairs, setup, and drink.
9. You can drink before all 4 packs of mobs and Chronolord Epoch.
10. Once Epoch is down, IMMEDIATELY talk to Arthas, loot while he's walking to the door.
11. Don't run down the stairs after Epoch, jump off the balcony.
12. The Gauntlet - good luck. Thunderstorm as much as possible, setup totems whenever you can (make sure there's a mana totem in there..). At the intermission, drink to 75%, do NOT wait on Arthas.

Kill Infinite Corruptor,

Profit.

Edit:

Drink points:
Before Meathook
After Meathook
Before Salramm
After Salramm
Before all 4 packs before Chronolord Epoch and the boss himself
Gauntlet intermission (only if needed)
Pre-Infinite Corruptor (if needed)

I use bloodlust and fire elementals on Salramm only. I do not worry about his adds if he summons them, the elementals take care of it.
I down Meathook with nothing special - just T+S.
Bloodlust will be back up for Infinite Corruptor - USE IT. There's nothing suckier than getting to him the first time and having him just walk through the portal because you ran out of time. Once you engage him if the timer runs out he WILL walk through the portal with you beating on his ass.

Now I really need to make a movie. :/