First, remove it from the fridge and place it on top of two sheets of overlapping plastic wrap.
Second, place two sheets of overlapping plastic on top of the marzipan.
Take a roll of twine and place it over the cake leaving 1 inch on all sides of the cake.
Cut the string off and use it as a template and guide to how big to roll the marzipan.
Next, roll out the marzipan into a thin layer between 1/8th and 1/4 inch thickness.
Most importantly, if it's too thick people won't eat it and it will break if it is too thin.
Use the string to make sure it will fit the whole cake.
Lay the sting across the circle and if the sting fits in the circle it is big enough.
Finally, lift off the top plastic wrap.
Carefully hold the bottom plastic and flip it over the top of the cake.
Next, gently peel off the remaining plastic wrap from the cake.
Finally, go around the cake and gently push and adjust the marzipan so there are no wrinkles or it isn't overlapping.
Use a fondant tool called a Gum Paste Icing Smoother to smooth out the marzipan.
Lastly, cut off any excess marzipan.
Roll it up in a ball or use it to make decorations for the cake top.