Jugular of a Juggler

Julian ran away with the circus at age seven to become a juggler. He gained modest popularity initially, but eventually he became the star of the Big Top show. This was a dandy accomplishment, except it came with a conditional hitch:  whenever the circus arrived at a new town Julian was expected to join the “wild bunch” and imbibe heavily at what one would call “regularly binge drinking level.” Yes, he developed alcohol use disorder (AUD), developed liver disease and portal hypertension. Julian was offered a Transjugular intrahepatic portosystemic shunt (TIPS) procedure to alleviate the symptoms of his diseased liver. A shunt would be driven from the jugular of the juggler to his portal vein. Can you identify the two vessels in the heart that the surgeon must juggle to drive the stent to the hepatic veins to complete the TIPS? 

Through which two vessels is a stent driven to reach the hepatic veins?