I've been casually frequenting cons for a while, but I have only begun selling for I am overly cautious when it comes to investing money and putting myself out there.
I tabled at Unplugged Expo in Toronto, Canada. Please note, this is based on a SMALL convention, so advice may differ slightly from a big convention. Still here are the Lessons!
Overall, I was lucky to make a profit for a first timer [all costs not just table], it was still a small con in it's second year with organization problems, and people generally wanted cheap deals with a few happy exceptions. What small cons are good for is getting your feet wet, but in the future i