You should start by reviewing the seller's feedback before placing your order. If they have a large number of positive AliExpress reviews, then that is a good sign. Next, you can rest easy knowing that you are protected with AliExpress Buyer Protection. If the seller fails to deliver your item as promised, then you can start the dispute process with AliExpress. They give the seller an opportunity to respond and resolve the situation. If the seller fails to do so, then AliExpress will issue you a full refund.