Self Help Authors

I read on a self publishing website that self published authors can arrange book signings. But where and how do they do that? I hear that most walk in book stores; especially big ones like borders and barnes and noble only like traditionally published books at there stores. So once my book is well known, I want to do a book signing somewhere. But where can I do it and how do I arrange it? I hear as a self published author, you have to arrange certain promotions like interviews and book signings by yourself. Essentially — The book signing I did for my book was in a book store and was a fairly small event. It was an independent book store and they contacted me. The book store did the hosting as a way to get more people in the door. I only sold 25 copies in that hour, but the store said they had about 3 times as many people come through as they normally would, so they were happy with the exposure.