What Is a sword style assassins would use way back when it was normal for people to walk around with katanas?

Question

I'm wanting to learn a sword style that is efficent for fighting in self defense, it would have to be a style that would make you very strong with a stick or weapon near by, do you know of one? I have anxiety so I won't be able to get a sensei to teach me, how should i learn without a teacher?

Answer 1

Yes, I do know one - but you cannot learn it without instruction.