Avoid all of the Highkeep guards. Sometimes this means waiting for one or more to path away from you.
If you are spotted by a guard, you'll be detained and taken to The Storeroom Office ( 148, -124, 122 ) Copy/waypoint 148, -124, 122, and have to work your way back after killing the guard.
Gnomish Stilts and a Feather Fall Cloak may be useful.
Steps[]
After obtaining the Sugarcane Press Lift Key from Kildiun:
Return to the Lift to Highhold ( -115, -160, -61 ) Copy/waypoint -115, -160, -61 and go all the way to the bottom.
Go to the Lift to Sugarcane Press ( -12, -159, -29 ) Copy/waypoint -12, -159, -29 and take the lift to the top.
Nibbles tells you to "kill Bull from above".
Move around the back of the sugarcane press, avoiding Yipnik.
Wait until Bull McCleran is right below you, walking beneath the exhaust pipes, then pull the lever ( -2, -101, 11 ) Copy/waypoint -2, -101, 11.
After the steam causes Bull to jump off the edge, take the Lift to Sugarcane Press down one level.
Click the Misplaced Crate of Rum ( 50, -124, 85 ) Copy/waypoint 50, -124, 85.
Return to Kildiun to complete the quest. Finish the dialog and then click Kildiun's Bag on the floor for your reward.