It's a weird sort of business, especially since I came into mixing up oils and infusing for witchy purposes, rather than aesthetic ones (at least at first) but with a strong sense of smell and olfactory migrane triggers, there was a pretty steep learning curve.
If you can imagine (he says if) the scents as colors, then you'll do much better with mixing them. I am a rotten painter with most media, but I was a passing watercolorist, so I have to sort of build scents very slowly from very dilute up to strong, otherwise they're crap, all muddy and horrible. As such I almost never do it anymore.