I wouldn't chance it not wearing snake boots plus they absorb all the cactus and briar damage...Danner 18" GTX Pronghorns are my faves. I have never come across a rattler in 18 years of TX hunting but I don't go sticking my hands into logs or under rocks either. You are far more likely to end up full of prickly pear and cholla spines, or get chiggers/ticks on you. Wear cotton camo and bring an insulated top for cool mornings and plenty of water if it's hot. I always tuck my pants in my boots and spray them with Off near the tops. I spray my waistline too underneath clothing and wear a belt. I always get a few scattered bites, and they aren't that bad, seriously itchy but you'll live. I don't hug the hog or deer I've shot, which has proved effective.
I'd wear the boots bring some pump spray insect repellent and toss in a pair of leather work gloves and some good quality tweezers in your hunting pack.
Welcome to TX, bro.