Why not just pick up this kit instead?
It's only $21.95 which is really a small price to pay for not having to set alcohol-doused strings on fire.
With this kit, you score a line across the bottle and then immerse the bottle in hot and cold water, at which point you can snap it apart at the score mark easily.
It also comes with everything you need to sand around the rim, making it nice and smooth. I TRIED to find a sharp edge on this glass and couldn't!
Pinterest is fun for some things, but keep your safety in mind!