You can, however, get a lot of things out of your house and get some reimbursement for them. Some items, such as used clothing, are hard to sell. You'll get far less than your investment. Paperback books will sell for only 25 cents to 50 cents each. If you price your items too high, you'll be packing them up and putting them back in your house.
Weather can be a concern.
On hot summer days, shoppers will look around longer if you can provide shade or cover. You might need to keep tarps ready for a sudden shower. Or, if items are on tables, they can be carried into a garage or under shelter. If the sale is inside, you might want to invest in carpet runners to protect rugs and floors. Indoors or out, both you and your buyers, also will appreciate comfortable chairs and some shade after a period of time.