Wine is an infinite subject and the only dumb questions are the ones you don't ask. A modicum of sobriety is highly recommended. Showing up for a tour or appointment after a Bacchanalian luncheon will not make you any friends. To say nothing of the local gendarmes who lack a real sense of humor about such matters. Be respectful of your hosts and their property.
Winemakers invest two years of their lives in the production of a bottle of wine.
The equipment may look simple to operate but is best left in the hands of those who know what they are doing. If you really like the towels in the guest cottage ask where you can buy them, they are not souvenirs. Say please and thank you at every opportunity. Certain guests seem to feel that having purchased a bottle of the hosts' wine in 1985 makes them co-owners. Displaying good manners will often get you extra opportunities to taste additional wines.