You don't need to be a wine expert to enjoy one of these tours, although you will find that, regardless of what you already know, you will have a greater appreciation of what makes a good wine at the end of the tour.
This is simply the most professional, informative and fun day out you are ever likely to have in wine country. You get to visit wineries that are not open to the public, taste a variety of stunning wines, and even meet the winemakers, all in an informal and enjoyable environment.
It doesn't get any better than that!