Scoring a hidden gem at the thrift store is always exciting, but shopping experts say a few common mistakes can quickly turn that bargain into a disappointing purchase. Most thrift stores don't accept returns, so it's worth slowing down before heading to the checkout. Interior designer William Lyon recommends resisting the urge to make snap decisions and taking a moment to consider whether a piece truly belongs in your home. Experts also warn against buying something just because it's cheap or trending. Instead, keep a wish list on your phone, measure your space before shopping, and make sure you actually have room for your latest find. Furniture restorer Kyle William McKeen says knowing the measurements of your home and even your car can help prevent expensive transport costs later. Before taking on a vintage project, consider the potential repair costs too. Reupholstering, painting, or restoring an item can quickly erase the savings of a thrifted deal. Finally, don't forget to use your phone while browsing. A quick search can help identify markings, confirm whether an item is authentic vintage, and reveal whether you've discovered a true treasure or something better left behind.