Well, in short... you don't :)
You can however study the traditional fighting arts of the samurai. A good start is to look in your neighborhood for an iaido or kenjutsu school.
Even nowadays there are still hundreds of active swordsmanship schools so despite you don't see or hear from them a lot, they are definitely there!
For a reference of what you are going to study, here is the first kata in the Zen Nippen Kendo Renmei Seitei kata range; mae. You can find all the seitei kata on our Youtube Channel but keep in mind that it's nearly impossible to capture all the right details by yourself. Joining a dojo will definitely help you in your training.