Not planning it for this year, but I've done it a couple of times, and it is great fun.
Try and sort out local accommodation asap. Try local B&Bs, Chambres d'Hotes, and the like. Or (if you like roughing it), there is a campsite in Pauillac.
The walk in the vineyards the next day (with more wine tasting, natch!), and lunch is worth doing, too (another reason to stay locally if you can).