Look, you're not taking notes to help save the world, you're taking notes to learn about your palate so you can buy wines that you like. That means documenting everything. Take a picture of every bottle of wine you drink and jot down a few notes, it doesn't have to be an essay. Simple, clear words can help you communicate your preference to your favorite sales person while helping you remember why you liked a particular wine.
For example, if you wrote that you liked the spiciness of several wines, and I realized that each of those wines was noticeable oaked I could infer that you enjoy oaked wines. If you wrote that you enjoyed a set of wines that was tart, well I would be trying to sell you wines with higher than average acidity. If you liked both, well then let me show you our selection of modern Barberas! It really is that simple. Combine a devotion to documentation with everything else we've discussed here and I guarantee you'll be better a drink by year's end!