Difficulty: Moderately Challenging
Step1
Start looking for others. To do this you can use Warcraft's "Looking for Group" feature, invite friends or utilize the trade channel and ask if anyone is interested in coming along.
Step2
Compose your group wisely. The typical group should have at least 1 healer, 1 tank and 3 damage per second (DPS) units. Tanks are usually warriors, druids in bear-form or paladins, due to their superior armor. Healers can be druids, priests, paladins or shaman depending on their specs.
Step3
Go slowly. Running an instance full speed in Warcraft can make an easy run tricky. Instead of hoping for the best, aggro as few mobs as possible and crowd control where you can. This can prevent a wipe or at least save your healer some mana.
Step4
Always wait for patrols. If they come upon you in the middle of a fight, you will be hard pressed to defend against the extra wave of fighters.
Step5
Use "Area of Effect" spells (AOE's) sparingly. Use regular spells for normal pulls, so you don't draw aggro.