"We have to keep a  Mandrake leaf in our mouths for... full moon to full moon." Melody instructed.  
"You're kidding." Dylan groaned. Then he looked at the calendar. "At least it's a full moon tonight."   
"True." She said.   
"Should we go to the Herbology classroom or Potions classroom?" I wondered.   
"Well, imagine the look on Snape's face when he realises all his Mandrakes are missing leaves!" Laughed Leona. "Come on, let's go to the Greenhouse."   
Finally, it was the 8th October and we saw the full moon in the sky. We went to a storage box at the back of the castle which nobody uses. We put our vials there and took the leaves out of our mouth and into the bottles.   
"What next?" Dylan asked.  
Melody looked at the sheet. "Add one of your own hairs."   
"Phew." We all sighed, removing a strand of our hair and dropping it in the vials.  
"Now we have to find dew from a place that human feet or sunlight haven't touched for a whole week."   
"I know!" Dylan ran past lots of spiderwebs into a box-filled room. "Dew!"   
"We took a spoon of dew each before carefully walking out of the room and dropping it in our bottles.    
"Add the chrysalis of a Death's Head Hawk Moth."   
"OH!" I shouted. "I know where some are!"  
I led them to a clearing outside the Forbidden Forest. Six chrysalises were there. I picked four and gave them to my friends. We put them into the bottles.   
"What next?" I asked Melody.   
"You must wait for an electrical storm. While waiting, you have to place your wand tip to your heart and say 'Amato Animo Animato Animagus.' Every sunrise and sunset.   
It took ages waiting, but we did sense a second heartbeat at week two. Finally, the Wizarding Network said "There will be an electrical storm at seven in the evening tomorrow."  
Finally.