The fondant is very forgiving and can be pinched back together if it tears.
Be sure to use extra powdered sugar for your hands and the work surface as you are working with the fondant to avoid sticking.
You can make the cupcake cones and press out the fondant up to a day ahead. (Be sure to keep the fondant tightly covered to keep it from drying out.) Wait until just before serving to drape fondant over cone; otherwise, it will stretch and sag over time (especially in warm temperatures).
If you have only one pan and a recipe calls for more cupcakes than your pan will make, cover and refrigerate the rest of the batter while baking the first batch. Cool the pan about 15 minutes, then bake the rest of the batter, adding 1 to 2 minutes to the bake time.