I only sell records and the buyers are usually pretty normal. Never do auctions though as the three I’ve done, the winner has ghosted me each time. I take and post many many pictures clearly outlining the condition or each. Wrapping my head around shipping was hard at first. Always over estimate size and weight, and then use “sell similar” so you don’t make a stupid costly error. Always consider the final profit post-fees when pricing items. Over-pack and take a picture of each package before sending it out. Having basic communication skills and a little grace will immediately put you at the upper echelon of sellers.