Preparing to Take Part in a Community Yard Sale?

Over the last 20 years we've had nearly 60 yard sales including huge benefit charity sales. In my experience in order of importance:
1. Signs (large and legible) any any other available free advertising.

2. Clean items in good repair (a bit of touch up paint or glue can make the sale) well displayed (avoid putting items on the ground or leaving in boxes as many people are not able or willing to stoop down or rummage through boxes). Not enough tables? A box of like items (no breakable or sharp items) is okay placed on a chair.
3. Price every item beforehand (I do not overprice as in our area when an item is fairly priced very few people haggle).
4. Have plenty of change, bags, and newspapers (to wrap breakables).
5. Relax - have fun and enjoy yourself. Welcome/greet each visitor. Play some happy music. Wear a silly hat (mine is a Crown complete with fake jewels and printed with "Her Royal Highness Queen of the Yard Sale" and hubbies is a huge wide brimmed Mariachi straw hat).
Have something to give away to all the kiddos (even just a sticker will bring a smile to a small child). When a customer asks me for info on an item I'm not familiar with I'll cup my hands around my mouth and call out to my husband "attention, attention...associate to electronics" (or hardware/automotive, etc.) We have repeat customers at all our sales and I often see folks when I'm out and about who stop me and tell me they just cant wait, when is the next sale?
Hope you have a great sale, it's hard work but can be profitable and great fun at the same time.