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He was lying on his back as hard as armor plate, and when he lifted his head a little, he saw his vaulted brown belly, sectioned by arch-shaped ribs, to whose dome the cover, about to slide off completely, could barely cling. His many legs, pitifully thin compared with the size of the rest of him, were waving helplessly before his eyes. (1.1)
This passage accentuates Gregor's lack of control over his new body. The body itself is described as an impermeable thing, like a tank. Gregor can only look at his legs; he can't control their movements.
Gregor's feelings his lack of control are definitely reflected in his job. And his feelings about his job as a traveling salesman are made clear very early in Part I of the story. He hates it for numerous reasons:
God! . . . What a job I've chosen. Traveling day in, day out. A much more worrying occupation than working in the office! And apart from business itself, this plague of traveling: the anxieties of changing trains, the irregular, inferior meals, the ever changing faces, never to be seen again, people with whom one has no chance to be friendly. To hell with it all!"
Even though Gregor despises his job, he continues to work because his parents owe Gregor's boss money. He plans to quit the miserable job when he has saved enough money to pay his parents' debt--in five or six years.