Begin by dusting your work surface with icing sugar to prevent your marzipan/fondant from sticking.
Knead your marzipan/fondant into a ball.
Gently begin to roll out the fondant/marzipan keeping your rolling pin horizontal.
Gently lift your fondant/marzipan to ensure that it doesn't stick and rotate it slightly in a clockwise direction. Give your fondant/marzipan a few more gentle rolls and rotate once more.
Repeat the process until the fondant/marzipan is large enough to cover your cake (top and sides)
To move the fondant/marzipan on to your cake, lightly dust the rolling pin with icing sugar then carefully roll the fondant/marzipan up. Lift the rolling pin over the cake (around the centre) and then roll it to unpeel the fondant/marzipan.