7. Preparation. (mockingjaypotter)
When Ginny was called to the headmistress' office later that evening they discussed the alias and disguise Ginny would use.
Finally they decided on using Polyjuice potion from a thirteen year old squib, Ginny was ordered to wait in McGonagall's office while the headmistress apperated and got some hair from the girl Ginny was to be impersonating. She then was going to go and get some Polyjuce potion from the Potion Master's store.
When she came back Ginny took some Polyjuice potion, set the vibrating alarm watch that the headmistress had given her to go off in an hour, and then went to bed in the first-years dormitory. She was going to explain everything to them in the morning. Everyone would know her as Saphire Whools who had previously been home schooled but because her O.W.L.s wer the year after next and she would need a year to adjust before the OWL preperation in forth year her parents decided to send her to school this year and onwards.