What's the difference between a professional baker and an amateur one? A professional baker presents their baked goods with flawless execution. Yes, the recipe matters too, but we can bet you've never been to a five star restaurant that serves good yet sloppily assembled food.
If you want to drastically improve your culinary expertise in the cake decorating field, then simply take a gander at this tutorial. You'll learn how to easily even out and smooth your cake using an inexpensive paint roller from the hardware store.