Getting a reservation through a broker is never a guarantee and can take awhile. It was going through this process that contributed to my finally becoming a member after several years on the fence. It takes 2 things to get a reservation. First the room you want: days, resort, size, view all have to be available. Based on what you want, availability can be very limited at 11 months, and will likely be limited at 7 months. Most folks looking to rent either want the low point categories (book quick) or the preferred resorts (almost all booked before 7 months and QUICKLY book at 7 months if not already gone). In order to book before 7 months, the person renting the points needs to own at that resort. Using BWV as an example, they bought at BWV villas because that is where they want to stay. They paid a premium for those points, versus other resorts, because that is where they want to stay. So by the 7 month window they use their points at BWV. If any availability exists at the 7 month window, at 8AM sharp, owners from the "lower cost" resorts quickly book any remaining availability. Someone having to go through the rental process, will take a few hours and may miss out on that limited availability. Next, even if the broker finds someone with points at BWV they are willing to rent before the 7 month window, it needs to match how many points they want to rent. If you want a lot of points, they may not have that many spare points. Second if you want 61 points and they have 75 to rent, they may pass on your request and wait on someone wanting (needing) 75-90 points. Those 14 extra points might be difficult for them to use/rent, so they will pass on your request.
I'm not saying it is impossible, just it can take time. And while that time is passing.... the availability might disappear. Keep you request open, but also look for alternative options; ask around you friend network, look at rent/trade board on DIS. If you go the non-broker route, read the sticky notes on the rental board, if you don't look to protect yourself, you can get taken......