I'm probably too far away to help (London), but would happily show you how things work if you're down in this direction. In my opinion, half a day of personal tuition will be far more beneficial than reading a book - especially when books tend to go into technical overdrive... (Although obviously if there's no-one nearby then a book is better than nothing.) Although they're quite expensive (less than a lens though), the Light & Land LF courses are very, very good.