Have someone there to keep you company.
$50 cash on hand in various denominations and coins is way more than you’ll need to give as change.
People will show up 45 minutes early on the first day.
A couple weeks before, make a list of the things/areas of your house you want to sort through for items to sell.
The Dollar Store is your place to buy garage sale signs.
Organize by price and/or type of item.
Books sell well at 50¢ for paperback and $1 for hardback.
Make things cheap. Make them cheaper the last day.
The baby items and (cheaply priced) furniture will sell first.
Keep track of what you sell and what you donate at the end.
Bring the dog(s). They’re good conversation starters.
Be prepared for some spectacular people watching.
Advertise better than I did. (Post it on craigslist.org more than the night before. Put the signs out 3 days before.)
Hang up as many clothing items as you can. They are easier to look through and more likely to sell that way.
You might not make very much money, but you will get rid of a lot (especially if you donate what you don’t sell).
Chill out, relax, and have fun.