The tips mentioned above for handling a bite are good to follow, however finding ways to not get a bite in the first place is much higher on my list. I grew up hiking and exploring in rattlesnake friendly environments and was taught to wear high top style hiking boots with either gators or long loose leg pants, most rattlesnake bites are to the foot/ankle, lower leg or hands. A good hiking boot will prevent fangs from penetrating and loose jeans are fairly effective as the are not tight to the skin. When going over a log, rock or other obstruction, step on top of the item and then away from the far side rather than stepping directly over and potentially near a snake tucked under the far side. Be careful when grabbing small rocks that are perfect for both leveling your rig and hiding snake that is snoozing underneath, perhaps use a stick to flip it over first. Use extreme care when climbing in and around boulders and narrow dessert canyons. Carrying a walking stick, walking with a heavy step can help announce your arrival and give snakes a chance to retreat. Remind yourself and companions often to be careful as snake awareness wanes the longer you are out and about without seeing one. So far I have not been to an environment where the species of snakes are either aggressive or hang from trees so have not had to deal with that.