If you have rattles in your area, read up on how to react should you get bitten. Do NOT treat the bite like seen in the movies! This includes cutting the site, suckling venom, tourniquets and other dangerous treatments. You could make a bad situation MUCH worse doing that.
I am speaking from experience, having gotten bit by a rattlesnake a number of years ago. You may have to move to get help, do it in a controlled fashion. Walk steadily to get to the house or car to call 911 or go to the hospital. I was able to see my snake, recognized the variety for ID at the emergency room. You might need a specialized anti-venom for treatment, so look at the snaked to remeber it. . Do not act hysterical, run for aid, that just gets your heart racing to spread the venom faster. Keep extemities, hands, feet down, hoping to let gravity help localize the venom make it harder to reach your heart. I had to sleep sitting up for a week after getting bit on the foot. Frozen bag of veggies may help slow circulation of the venom area. Ice pack is good, but frozen veggies might be faster to grab, easy to shape on the bite site.
Hope you NEVER get bit, it is very scary, nothing I would wish on anyone. Snakes do not have to be coiled to bite. Small, young snakes pack as much wallop in venom as large snakes. Keep your eyes open, baby snake may not have enough buttons to rattle loud enough to hear and be warned to jump back away from.