To have a yard sale or not

I've been wanting to have a yard sale for a while now. So I'm trying to decide if we will or not. It will mostly be my stuff. The bad thing is I already got rid of a lot of my things on freecycle & brought a lot to Goodwill. So I don't have as many things as I would have. Another problem is finding time to have 1 & planning it & all. Maybe we'll wait till early September. I've been trying to get some things together. Does anyone have any advice on having a succesful yard sale? I've never had 1.