Now I'm more of a perfumer than a candle or soap person, so my advice might not be quite what you're looking for, but I do a lot of blending with fragrance oils to make my own fragrances, and sometimes the formulas get really complex. I think the most important thing to making successful blends is to know your oils! Be aware of how strong they are, how they change over time, and how they tend to play with other scents. And if you're going to put it in something, it's good to know how it behaves in product. The best way to get this is to experiment. Play around with oils and have fun! Try stuff out, even crazy stuff. You never know what'll work well until you try! The best part about blending is that there aren't really any rules (except max usage rules, those are sort of important! ) I usually use single notes (just Jasmine, just Rose, just Strawberry, stuff like that) but honestly sometimes blends are really nice to use if you're looking for some specific character that the individual notes don't really give you. Sometimes the blend is better than the sum of the parts. If you're just starting out and buying oils to start with, though, I would recommend single notes. If you're worried about wasting materials, I would suggest the q-tip method, or even just smelling the caps of the fragrance oil bottles together to see if you like the combo. Just be sure to have fun! It's not as scary as it seems!