mafoofan: "But I would never recommend a novice buy an expensive bottle of wine without knowing what he is doing. If he must buy a bottle intended to be enjoyed later, after he has acquired a taste, he is better off relying on the advice of "experts" to begin with."
I would not reccomend that too, but errors and trials are often an obliged way for many. As said by Brendon, suppliers and salespeople give lot of misinformation and this can be a real problem for the inexperts.
Petepan: +1, I'm with you "just a part", hand, knowledge and experience.