Although I respect your choice, and have momentarily considered snake guards a few times.... I've never had a reason to wear them.
I hunt in the desert, mountains, and everything in between. Everywhere I go, there are a few Pit Viper species (in North America, that's a Rattle Snake, Copperhead, Water Moccasin, or a few others - of course).
I have had plenty of run-ins with Rattlers. Not one of them ended with a real bite*. Usually, the snake was more scared of me, than I was surprised to see it. Every one of them, that was within 10 feet, gave me warning. That ominous rattle sound is unmistakable. If the snake doesn't feel like leaving the area, I do so cordially. (There's no point in throwing rocks or sticks, or shooting it. It's the snake's home, not mine.)
My snake rules:
Keep your eyes open - don't fixate on the trail.
Watch your step.
Watch your hands when climbing steep slopes.
Don't stick body parts in nature's dark holes - especially in rocky areas.
Don't sit on rocks that look like snakes enjoy sunning on them.
If all else fails - Rattle Snake is quite tasty.
*I said above that not one of the encounters ended with a "real bite". My family has had a few bites at our ankles by smaller snakes, but none penetrated our pants and/or boots. My brother is the only person I know, that has had a successful bite. He got scratched on the ankle by fangs that barely penetrated his heavy pants. None of us has ever had a large snake even attempt to bite.