Start out by getting everything you need for you drink gathered together.Note: you can mix this one straight in the glass as explained below, or you can mix it all together in a cocktail shaker.
Take some ice and use it to fill your glass almost to the top.Note: either a rocks or highball glass work for this drink.
Take your fireball and jigger and measure 2 oz of fireball. Toss the fireball into your glass.
Take your eggnog and jigger and measure 4 oz of eggnog. Toss the eggnog into your glass.
Take your bar spoon and use it to thoroughly mix together your drink.
Grab either cinnamon or nutmeg (whichever you prefer) and sprinkle several dashes on top of the drink.