You can use your fingers to mash, but you need something like 30 inputs in barely a couple seconds, so the point of the bottle is to hit all the buttons at once much faster. Obviously you can use whatever method you like (someone suggested covering their hand with a sleeve and running that over the buttons quickly), as long as you can get the 30 inputs.
The reason I say flying over to the right side for On the Streets is because all the attacks will be going towards the right side. You will be on the right side of the opponent because of the starting position (you in the left corner, and the opponent standing right next to you), but your attacks will be facing away from them.
I gave a sample string of attacks with breakdown in my beginnings of a trophy guide which didn't make it into Setsuna's guide, and it's been proven to work for me as well as many others. If you follow it, it will work as long as you get the correct inputs - maybe practice with her specials so you know what to expect.
I have no video recording software, so I don't have any way to put up a video.
Proud owner of Arcana Heart 3 platinum trophy, earned without boosting.
I don't accept blank friend requests.
I also write trophy guides sometimes...