If you remember nothing else about a whisky or a distillery, always try and make a mental note about whether you enjoyed
it or not.
That way, if you're ever asked, "What do you think of Glen Googly?", even if you've only tried one of the 15 expressions available, you're always able to say, "Well, I've only tried it once, but I thought it was.......[Insert good or bad comment as appropriate]"
I make a point of constantly reading my notes and other sources so that I'm always able to draw on an opinion when needing to contemplate or give advice on a whisky. Do this for 5 to 10 years, and you'd be surprised how much stays in your head!