I don't think it will be hard to find a BCV owner to rent points. BCV owners can reserve accomodations 11 months ahead of the desired check out date. Other resort owners can reserve 7 months ahead of check out.
If it were me, I'd start looking about a year in advance. That would give me a month or so to find an owner and negotiate the rental terms before the booking window opens. It's probably not necessary to reserve so far ahead, but BCV is one of the smaller
DVC resorts. Because of its location and the wonderful pool complex, it's popular. I'd feel beter having my lodging nailed down so I can concentrate on getting good airfare, and the rest of my trip squared away.
There are some disadvantages to booking so far in advance - most rentals are considered non-refundable and you probably will need to pay in advance. Lots can happen in 11 months, so be sure you understand the owner's' payment terms and cancellation policy. Also, some owners charge more for locking in the popular locations at 11 months.
Anyway - good luck! BCV is a great resort and you should have a wonderful time.
Best wishes -
P.S. If you haven't already, be sure to read all the Sticky/Important threads at the top of the Rent/Trade Board. Lots of good info there that you need to know before you start the process.