If you have snake boots, wear them!
I am in the field in South Texas frequently both for hunting and for my work for ranches. You’ll walk by twenty snakes in the grass on a trail, brush, or cactus for each one seen in the open.
They hide on the edge of grass and brush lines waiting to ambush rodents and other prey. In the grass or brush, the rattlesnakes are close to invisible in the brush. Here is one I videoed last year. Watch as it goes back into the brush. I happened to notice its head as we drove by, so stopped to watch it.
Here is another:
Here is a classic rattle that causes an instant blood pressure spike. They can strike out 4’ - 6’ depending on the size, but will not unless provoked or stepped on. If you step on one, you will want to have snake boots on or even chaps. Also watch up too as they climb up off the ground to catch birds and lizards. I have seen one up high in a mesquite tree. Overall, stepping on them is the only really dangerous scenario. Usually the first guy in a line steps on it and number two in the line has all the excitement.