Is it possible to withdraw an application or change it to regular decision before the Novemeber 1 deadline for an application that has been sent ED?
I would think you can always withdraw an application, whether or not you can change it to RD, you should ask the school in question directly (maybe anonymously)
Talk to your guidance counselor.
Yes, you can contact the school and ask them to move you to RD or to withdraw. Do let your GC know, though.
You don’t need to do it anonymously. Of course you’re allowed to withdraw or move from ED to RD as long as it’s before the actual notification. There is no penalty. Out of politeness, do so sooner rather than later.
Ultimately, they WANT you to attend – not to become a burden to you.
Do I have to do this before December 15 notification or must it be by the November 1 deadlline for early decision?
Notification – but don’t count on Dec 15. Often it’s a few days earlier.