Yes, saw the tutorial too, and cutting the cupcakes to have straight sides... I thought it would be better to get a cake sheet and cut the circles of cake with a circle cutter. Faster.
Frost the outside, then fondant, and vellum paper (plus other details).
I once saw another tutorial (in another language) of someone who made a roll (with cake baked in a jelly pan), put in the filling, rolled, put the whole thing in fondant, and cut to size. A different technique, but I thought it was a very smart one.