I'm probably gonna get shot down for this, but here goes anyway:
Download as many quality games of you selected opening as you can find, maybe here: http://www.pgnmentor.com/files.html
Put this database in your chess program, and play through the games one by one, spending no more than a few seconds on each position, and all the time trying to predict the next move.
After a few hours and a few hundred games, you'll have a pretty good feel about pawn structure, traps, strategy, what pieces belong where etc.
What are people's tried-and-true methods of learning opening systems? I know many openings at a basic level, but beyond 3 or 5 moves, I start to get confused. For example, I can easily recognize the Sicilian Defense, Ruy Lopez, Grünfeld Defense, Queen's Indian, Nimzo-Indian, etc. But when any of these start branching out, I feel overwhelmed. How have any of you tried to memorize some of these systems?
I have thought that quizzes on openings would greatly help me. But along the same lines, I can easily ace many openings quizzes, because they only go about 4 or 5 moves deep. It's beyond that point that I really struggle, but I find no quizzes that go that far.
I should add, also, that I have no desire to memorize openings ONLY, because mere memorization is not actual chess. But I do want to become considerably more secure in openings. My education of chess openings has stalled for the past few years, and I can't find a way to break through it. What has worked for some of you?