Yes this is exactly right... how would i start the mission over? I don't see this option.
So what you would want to do is go to the main menu. At the main menu is a "Mission" tab. Then choose the "Golden Cat" mission from that list. If this is the first time through, all later missions will show as locked.
This mission save will start the mission over for you, while keeping all statistics and choices from missions earlier in the game for you.
Also for the next playthrough, be careful about releasing the weepers from the basemant room as this is the most common cause of Slackjaw's aggression. (The ones outside are scripted, just don't lure them inside the distillery or they can have the same effect).