What's the thing(s) that's a stick in your gears. The thing that is keeping you up at night, stopping you from getting to the next place you want to be in the world of reselling? There's comfort in shared misery - maybe some good solutions too!
I'll go first: Paperwork, bookkeeping etc. It's one of the reasons that, as an auctioneer, I don't take a lot of consignments. Suggestions?