Write a book about a child wizard going to a wizarding school. Make a movie about a teenager thrust into a rebellion to stop an evil mystical empire. See if you get contacted by any lawyers.
I am just going to address this, because you are so set in your Ramby hating ways that nothing anyone says is going to reduce your secret love for him.
In reply to this, all I have to say is that you must not read much fantasy. First off Rowlings was no where near the first to write about a child wizard going to wizarding school, and will not be the last. If I were to go write a book with that theme, I may get contacted by lawyers, but they would not have a leg to stand on unless I made it so similar that you couldn't really tell the difference. Just look at the fantasy series out there that basically tell the same story, with the same difficulties, by many different authors, and there is never a plagiarism problem. The only one that I know of the Rowlings went after and won against was Larry Trotter (or whatever it was), and that was because the guy wrote pretty much the same thing with name changes here and there.
How about this example: Boy discovers he has magical powers. He leaves his homelands because it is not safe. He meets a girl. He sets out to save the world from the lord of evil. He gets captured by a group of female spell users, who enslave him for the good of humanity. He gets away. ect.
What series is that?
Some people would say Jordan's Wheel of Time, and some would say Goodkind's Sword of Truth.