Even if the weather says it will be a wonderful day, be prepared for the worst weather mother nature can throw at you . I learned the hard way in my first tournament this year, was expecting 60 degrees and overcast so only took a light rainsuit to wear when my boater made runs and a sweater to cut off the chill. We get a winter storm advisory the day I go to pre fish and the temps end up being in the 10s and 20s the whole weekend with 20 mph winds. 400 angler for a BFL and Weekend Series event in town at the same time made impossible to find reall good winter clothes and I live 100 miles away and the roads were icy. Something I have learned, during the week, start your gear prep when you have extra time during the days leading up to the tournament. I have been up till 12 and 1 in the morning respooling reels cause I thought, "I can just do it before bed, I got plenty of time".
I am no expert by any means, this is my first year, but I have learned these 2 important lessons in preparation.