I have so many, it's hard to say which one was the biggest. No-No's... lets see......
Probably my number 1 was getting over someone else's definition of low n slow; trying to make a masterpiece at a temperature that was unnaturally low, frankly way too slow, smothered the fire so it produced tons of billowy white creosote laden smoke, and producing bitter, over-smoked, dry pork crap.
Hance - Lake Dogs Cooking Team - MiM/MBN/GBA CBJ and comp cook
Lake Sinclair, GA (strategically about an hour from darn near anywhere)
Started competing in chili cookoffs back in the 1990's and have competed in more than I care to count. I became a CBJ in MiM in 2005, then MBN and in GBA in 2010. I've probably judged 130+- BBQ comps (sanctioned and unsanctioned) over this time. That said, I really enjoy competing more than I enjoy judging, and hope to get back to doing 4 or 5 a year in the near future.