(1) Take in the dramatic view as you enter Kal'Hirol. Soon you'll be on ground level eye to eye with angry darkspawn.
(2) You meet a dying legionnaire, Jukka. He tells you that the darkspawn are breeding an army in the depths of Kal'Hirol. To stop the army, you must destroy the broodmothers responsible.
(3) Several paces after leaving Jukka, the darkspawn ambush you. Genlocks flank you on either side after you cross into the open area. Send your tank against one side and your next strongest melee DPSer against the opposite side. The healer and fourth party member support whichever side looks like they need it more. After the genlocks go down, shrieks will sneak attack when you think the battle is over.
(4) Hurlocks ambush you before the bridge. Look for two groups to swarm out from behind the rocky outcropping to the southwest. As with the genlock ambush, split the tank and second melee DPSer to separate enemy groups.
(5) On the far side of the bridge, deepstalkers harass you on the climb up the hill. Finish them off and pick up your first signs of treasure in the area with the nearby vase and ancient dwarven crate.
(6) You reach the outer walls of Kal'Hirol at the top of the hill. A host of darkspawn guard the outer gate. Expect a swarm of skirmishing hurlocks to pin you down while the hurlock archers take shots at you from range. Send your melee characters into the charge and hold the line. Ranged attackers should bring down the darkspawn ranged attackers (if they're in range) first, then turn the fireworks on the melee darkspawn. Heal often to avoid losing anyone in this fight.
(7) Inside the courtyard, deal with the childer grubs that spring forth from the pods in the area. Stay near each other as the grubs attack. If someone gets overwhelmed, turn the party's attention to that character's aid. The grubs aren't difficult on their own, but they can swarm you quickly if you aren't careful. Loot the area and then make your way up the steps to Kal'Hirol's main entrance (if you don't have Sigrun in your party).
(8) If you have Sigrun in your party, search the western courtyard wall for a hidden switch near the carved visage. Open the secret door and enter the side courtyard. The side entrance into Kal'Hirol routes you to the upper level where you can sneak attack the golem master that coordinates the darkspawn's main gate defenses.