When I have needed to mix several different recipes at the same time, I begin by making sure all the bottles are labeled. Then I put a little piece of paper in front of the bottles with the recipe for that bottle (or bottles). I take off all the lids and add either a carrier oil or water, depending on if it’s to apply to the skin or for a spray.--Then I start adding the essential oils one by one. I put all the oils I’m going to use in one place, and as I add them to the recipes I put them aside so I know which oils I’ve already added.
This has helped me to easily make several recipes at once.