I made a square fondant covered cake not long ago and I learned some things from it. First, don't put a ton of filling in because you'll have to smooth the cake a lot, and the filling may start to squish out and make a bulge. Second, put the cake on something raised so that the fondant can hang down past the board.
When I did it, I shaped the corners first by smoothing them down with my hands. Then I smoothed the middles of the sides, and went back over it a couple of times with the fondant smoother. Then I used the flat side of the smoother to indent a line at the bottom of the cake, and trimmed the fondant. After that I went over it one more time, using the fondant smoother and one hand at each corner to kind of press a nice edge to the corner.
I'm not sure I'm describing it too well here...maybe someone else has some advice too.
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