I have hunted rattlesnakes here in Texas for several years. Rattlesnakes are easier to hunt than other animals, in that they are outside on the same days people like to be out. They are difficult to hunt here in the summer because they are unpredictable, but hunting improves as the nights get colder. Here, the best hunting is from November to February. They are less likely to stray from their den. The ideal time is when the sun is directly overhead. I usually hunt from 11:00 to 3:30. The rocks and the air haven't warmed enough in the morning to bring snakes out. Shadows grow long and the snakes begin getting too cool late in the afternoon. Another point to remember is that good dens are almost always located on the south side of hills and abandoned homes. This is because sunlight makes the south side warmer.
Since the snakes are worth more alive, I use snake tongs. I believe they are made by Midwest (
http://www.animal-traps.com/midwest.htm ). They are the standard tong. To prevent the snakes from backing up, I filed some small grooves on them. I also use a rubbermaid trash can with holes drilled under the lip for ventilation. After I locate a den, I always approach very slowly and cautiously. Snakes can feel the vibration from footsteps, alerting them to seek cover. I grab them carefully and put them in the trash can. Some go easier than others. I grab smaller snakes about the middle, larger snakes about 10 to 12 inches from the head. Grabbing them right behind the head makes them flail wildly, occasionally able to free themselves. I plan my moves carefully before grabbing the snake, and then never take my eyes off him until he is safely in the barrel. People usually get bitten because they were not paying attention. Most people look where they step, but act carelessly after catching the snake (when he is mad!).
Snake hunting is fun, but be careful.