Fulfillment. I handle all my own shipping (buying packaging supplies & packaging up orders) and it takes up just a TON of time, brainpower, physical work, and also the bulk of my customer service time (answering questions re: ship times, inventory miscount, sent wrong item and need to pay to ship the correct one out.) I'm actually thinking about whether I can outsource any of this and pay someone idk hourly or something to do 4-6 hours of shipping for me a week but don't know how I would go about actually doing that. :/