There are no absolute rules when it comes to blending oils, ultimately it comes down to your preferences,
but there are a few guidelines that will help you if you’re new to blending oils.
A straightforward way of blending using this model is to pick essential oils within the same scent family.
Another technique is to pick essential oils from two scent families that are well-known to blend effectively together. Such as,you would expect Peppermint, which is a Herbal oil, to blend well with a Citrus oil such as Sweet orange oil or a Woody oil such as Pine or Cedarwood.
If you want to create a blend that promotes relaxation and eases stress, you could choose essential oils that are calming or uplifting (such as Bergamot) and avoid those that are known to be particularly stimulating or energizing (such as Ginger or Grapefruit).
Essential oil blending is as much an art as it is a science. Each model is simply a guiding force, and which one you ultimately use simply depends on your tastes and preferences.