I do out as far as I can, never adding my credit. I cancel several times, as I find a better deal closer. If not, than I am happy I have the rate I was at least willing to reserve. Right now, I booked for end of December, and have rebooked several times, but lately has not changed. I found, at the end of summer, the best rate was right before I left, but for the holidays, I was glad I reserved at least 3 months ahead, as the rates got higher and higher closer.