When you hear the words "pawn shop," do you imagine a seedy back alley, with questionable characters milling about? That may have been the image of years past, but that reputation is no more. Pawn shops are gaining recognition as reputable places of business, for buying, selling, and for borrowing. Here's how they work. You've got that garage full of junk, that you know somebody would be interested in, but the thought of having a garage sale fills you with dread. Those long hours, people haggli…