When I first started I only used VCO because it was all I had. Now I have sesame and sunflower and I just rotate with these. I don't follow any set plan, just use whatever I feel like using at the time. I still use VCO more often, because I like it the best. Sometimes I use two different oils in the same session (20 mins with each). I just go with my intuition and do what "feels" right.