Be prepared to use a LOT of the topping item. Make sure that your frosting has not crusted yet and hold the cake over a bowl or brownie pan to catch the overflow. Tilt the cake slightly and pour handfuls over the side, turn a little, tilt again, pour more over that area. You can reuse the overflow from the bowl as you go, but you will still have a lot of waste (in my limited experience).
If you manage to master this art, do post a picture in the Life Celebrations forum (or Seasonal, if appropriate).
I set my turntable on a cookie sheet, Place the cake on the turntable, put my topping/sprinkles on the cookie sheet, then just grab handfuls of the topping/sprinkles and gently press them into the sides of my cake turning the cake and applying the topping/sprinkles all the way around. Always press from the bottom and work upwards so you don't pull the icing toward the bottom of the cake.
Hope this helps
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