We have to inform the gods about his unacceptable behavior!
Gilgamesh's ordinary world includes his overindulgent and arrogant manners. He does whatever it is he desires, such as raping women, angering the townspeople, who then pray to the gods to control him.
Gilgamesh's call to adventure commences when Enkidu, the Gods' creation to control Gilgamesh, desires to meet Gilgamesh. They both fight until they become close friends. They ultimately decide to slay Humbaba.
I want to meet this Gilgamesh person.
I thought you would, Enkidu.
The Hero's refusal of the call is very brief. It occurs when Enkidu warns Gilgamesh of just how powerful Humbaba is, and how their lives are potentially at stake if they proceed with this adventure.
Maybe we shouldn't slay the almighty and powerful Humbaba...
Despite Enkidu's warnings, Gilgamesh persists on pursuing their adventure. Gilgamesh meets a mentor, the goddess Ninsun, Gilgamesh's mother. Although she isn't too passionate about her son's decision, she blesses him anyways.
I shall bless you, my dear son.
Gilgamesh crosses the threshold when continuing his adventure with Enkidu. Although Gilgamesh had been warned about Humbaba, Gilgamesh leaves these warnings behind and persists.
Once Gilgamesh is out of his comfort zone, he encounters several tests (defeating Humbaba), allies (Enkidu and Shamash), and enemies (Humbaba and Ishtar) which will affect his next ordeals.