This is not directly useful while flying but I'm using it in my Holding Calculator - just needed to keep track of this website and couldn't think of anywhere else to put it!
The “lightbulb moment” will come when you realise that when your instructors keep mentioning the word “visualise”, it really is the key! This is true for VOR, NDB interceptions, holding etc.
What it means is essentially to look at your HSI and really imagine the scenario on the face of the instrument. I'll make some diagrams here when I find time. It's far better than learning rules because rules can be forgotten. It's harder to forget 'logic'.