The easy answer to your second paragraph is to trade only those signals that are easy to spot. But as for the specifics of the relationships between price and volume, I'd have to see examples. Sorry.
As for having to do with the market, yes. Due to the enormous increase in funds, arbing, hedging, whatever, the volumes on the indices are largely irrelevant, maintaining a consistency that they didn't have thirty years ago. However, I'm not sure what you mean by "price-volume techniques". Perhaps you're trying to apply what you believe you learned in one timeframe with another timeframe that's inappropriate. If, for example, you were to look at Farley's book, you'd likely think that it all looks pretty clear and relatively easy. But nearly all his examples were taken from a narrow window during the bubble period of five years ago. Applying all of that to today's market would likely be problematic. More helpful might be an examination of the '94 market.
As to mastery, probably never. To master this means mastering human behavior, and few people are capable of that. Understanding it well enough to take advantage of it, however, is another matter. I've said that I trade fear, but many people couldn't care less about that. They have no interest in it. And whether or not they can apply the principles of trading by price without being interested in trader behavior, I have no idea. I should think it would be very difficult. But I haven't done a study of it. It does seem, however, that those who think it's all baloney would never even try.
In any case, it'll take more than a weekend seminar . . .
--Db