For both, the herbs need to be purchase in the powdered form...and then just mix them together as you would thoroughly mixing the dry ingredients for anything.
A wire whisk works great for small batches (or putting them in a jar with lots of space and then shaking thoroughly).
Remember, you'll be making 'dust'...and cayenne dust 'up the nose' causes sneezing (and down the throat and into the lungs causes coughing).