I'm still working on my business plan for a distillery, but have written several in the past (as a partner in other business ventures). And one of the best things I've found about writing a detailed b.plan is that a well thought out plan will provide you with a document to "live by". In any business there are ups and downs, but a solid plan will keep you moving in a forward direction. This is not to say that there shouldn't be a point of flexibility, but you can make that part of the plan.
Good luck to you Seth.
Burton