I used to work along with the Arizona and California Wildlife Departments on the bombing ranges in Arizona and California. Most snakes are just as happy to get away from you as you are from. They normally don't bite unless cornered. Because of the large Western Diamondbacks, we wore leather boots and leather chaps. Part our work was catching, weighing, measuring and releasing. We caught hundreds of different varieties, Western Diamondbacks, Sidewinders, Blacktails, Coral Snakes and Gila Monsters. Did it for almost six years and no one got bite.
Because you are detecting, you are most likely looking down, this is one of the best positions to be in. You will probably see the snake before you get too close. If you see one, back away. If the snake saw you first, he is probably moving away from you as fast as you are from him. Don't mess with them. Let them go. It will probably go somewhere to hide. Also, snakes don't move around as much during the day as the night. They are usually nocturnal. The only snake I ever ran into that was aggressive was the Cottonmouth Water Moccasin. They can be aggressive, but usually they are near water or marshy areas. Don't reach into a hole or opening you can't clearly see into. You never know what is inside.
I did get bitten as a kid about 8, but that was my fault, I sort of cornered a small one against a big tree root and didn't know it was there. Got too close, was barefooted and got bite. Had to take anti venom, but was only a little sick for a couple days.
Safety from a lot of things is why I recommend hunting in pairs or groups. You can look after each if something happens. Cell phones are useful when in an area where you get receptions. It doesn't work in all places. When I go out alone, I always leave a note with a map or directions so my wife can find me (sometimes unfortunately) if I stay out too long. Usually, I get a cellphone call before she goes out in the woods looking for me.
Snake bite kits are OK, but I have never had to use one. If you or someone gets bitten, stay calm (as possible), put a moderate tourniquet above the wound closer to the heart if on your arm or leg, to slow down the flow but don't completely shut off the blood flow. Release it about every fifteen seconds a little to keep good blood in the area. The tourniquet is to only slow down the progress until you can get to help. Shutting down the blood flow completely can cause harm that may be more serious than the snake bite, such as blood clots or loss of a limb. Because of the availability of anti venom and medical help, rarely does someone die.