FEN/VAX
I wish I had some solid advice to give you, but I felt exactly the same when Slayer's Cake fell into my lap. I've largely just hired others to handle it, while it stays in my name in the hopes that Vex will come back and want to keep it going.
Which is to say, I don't think you should be afraid to do the same, if you want to focus on your smithing and then hire someone to handle the books and that sort of thing. It's an undertaking.