The single best consumer step to avoid return-related surprises is to check and save the seller's return policy before buying. Return windows, restocking fees, and shipping responsibilities vary widely; assuming 'returns are free' is a risky habit. For higher-value purchases, screenshot or save the return policy and any communication that mentions it; this gives you leverage if the merchant later claims a different rule. Verifying policy before purchase avoids awkward surprises when you need to return an item — some clear examples: holiday or clearance items may have stricter deadlines, and some marketplace sellers or international vendors impose higher return costs. Knowing the policy also helps you decide how to buy (e.g., prefer vendors with free returns when buying something you may not keep).

Operational tips: add the policy screenshot to the order confirmation email or take a photo of the in-store receipt with the printed policy and save both in a folder (digital or physical) tied to purchases. If buying online, simulate a return flow (some merchants show return instructions before purchase); if you don't see a friendly policy, consider a different vendor. For expensive items, buy with a card that offers extended return or purchase protection. The key is proactivity — a small time investment before checkout avoids hours of hassle later and ensures you can make decisions without surprise costs.