Since Poly is only studios, and not 1 or 2 bedrooms, getting one should be not a huge problem right at 11 months. I think there are more LV.
Walking is when you start a reservation earlier than you really want. Say you want December 10 to 17th. Instead of waiting until Jan 10th to try and book, you check earlier,
So, say you check on Jan 1st and see the room is there for Dec 1 to 8. You book. Then, you go in and modify the reservation moving it every few days until you get to the actual dates. As long as you modify that original reservation before it ends, you will be guaranteed to get your dates,
To be honest, I actually was lucky today and got a BWV SV room for next year right at 8 am, One of my friends wants to go over NYE in 2020. Wasn’t planning to walk, but when attempted it...November 28 to Dec 3..and I got it, I booked!
Now, I will change it ever 3 days until I get her actual dates of Dec 27th to January 2nd. So, yeah, I am walking one for a month. Not sure it would have been needed, but it’s a pretty hard room to get so wasn’t taking any chances especially since I figured I’d be doing pool/garden view