There is a simple procedure for blending all the incenses given above:
Grind the resins in a pestle and mortar, to the consistency of coarse sea salt.
Shred or grind herbs finely using a knife or pestle and mortar.
Cut, shred or grind animal or mineral components to dust, or small pieces.
Combine all the above ingredients with the oil, so that the powders adhere to the coarser resin.
Store in an airtight container, making sure to label it with the name of the incense.
There are more complex ways of composing incense; the most pleasing I have found is to form pellets, pills or pastels, such as Agrippa suggests for the composition of his Solar incense. The basic principle here is to make “flour” from the dry ingredients of the incense, grinding them up to a fine or semi-fine consistency and then proceeding to blend this “flour” with the liquid components, to make a “dough” which can then be moulded into pellets. In Agrippa’s recipes this liquid is often blood, which whilst being an effective binding agent, does not strike me as smelling particularly pleasant to the human nose when burnt. If you wish to try and make pellet incense of your own, using the recipes given here, I would suggest using a viscous resinoid version of one of the resins listed, and using this to bind the powders together. Essential oils do not tend to be thick enough to hold things together, so consider using balsams, resinoids, or when appropriate honey (especially relevant in recipes for the Sun or Venus). A helpful last step in this process is to roll the pellets in very finely ground powder made from one of all of the ingredients. This stops the outsides being sticky, and helps to set them into shape.