this isn't a mistake per se but it's a way i learned to try to prevent mistakes...early on when i first started training, like the first 3 days ever, i noticed that the stem and branches were WAY more pliable about 30-60 min post-watering (which makes TOTAL sense once you understand the science of it). but so i learned that i should do all my training in that window if i wanted to achieve the "safest possible" results. i split a main stem and broke a couple of tiny branches along the way to realizing this.