Don't place knives, scissors or other sharp objects low enough for a child to grab. Charge "early birds" double. I prefer to start the sale at 7am because they are going to be there at 7am if you advertise you are open at 8am. 7am - 3pm works great for me but I just couldn't handle more than a 2-day sale. If you are selling earrings, cut an index card in half and insert the posts through the card. It makes it much easier to display the earrings and the pair doesn't get separated. Good luck and have fun!