wubbles comments on Harry Potter and the Methods of Rationality discussion thread, part 21, chapters 91 & 92 - Less Wrong Discussion
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This happened in Canon, and was done by Hermione herself, albeit in her I think 6th or 7th year.
Hermione didn't erase her own existence, but implanted false memories to get her parents to go to Australia. Distance did what magic couldn't.
Actually, she did both of those things. And, incidentally, it's the false memories bit that would be impossible in Methods - Hermione, of course, did not spend years to give her parents what are apparently years worth of memories.
It's only perfect, undetectable Memory Charms that require that much time. Giving someone years of memories in the quality that is customary for years-old memories, when no Wizard has anything against it, is probably not that difficult.