Nearly everyone who handles snakes on a regular basis will get bit sooner or later. I witnessed a woman once in the ER screaming at an ER doctor for putting a band-aid on a bite her son recieved by a garter snake in their yard, She demanded he be hospitalized. It's exactly that fear and paranoia that gives reptiles a bad name, It's an irrational fear of the unknown and trust me, irrational fear is a dangerous thing. The doctor was entirely right, It was a small harmless snake and the best thing to do is just clean it out with some peroxide, Maybe a lil Neosporin and slap a bandage on it, You have nothing to worry about, Obviously if there's a tear that may need stitches, Or you haven't had Tetnus shot in years then a trip to the doc's might be in your future but not in the back of an abulance I assure you. :o)
Poisonus Snakes

These snakes are of course a different story. The tales of instant death you're used to hearing don't likely apply, Especially here in Ca where our poison snakes rank pretty low considering. Not to say it's not a very serious situation, You can easily lose a limb, Suffer brain and organ damage or even die if you do not take the proper action immediately. Most people when asked what to do if bitten by a poison snake the first thing they think of is "Suck out the poison and tie it off" which isn't quite right. If you happen to have a snake bite kit handy that comes with an aspirator (that lil bulb thing that most of us get after we have a baby to clear noses) then as a SECONDARY course of action you could use that to maybe remove some of the poison. You do not want to try and suck it out with your mouth, It can do as much damage floating around your stomache as in the other persons blood stream. Most snakes get it deep enough that it circulates and the aspirator wont likely help anyway, And I say secondary because the first thing you do is GET HELP. Get to a hospital, Get an ambulance on the way, Something as fast as you can, The anti-venom is your only chance. As far as cutting off circulation, It doesn't really help either, When the bandage is removed it will only get pushed through your body twice as fast and in the mean time while it's been confined to one area, It can do twice as much damage to muscles etc. Depending on the snake you have a pretty reasonable amount of time to get to a hospital without suffering any major harm.
Large Snakes

Perhaps my most widely inquired about question, "What do I do if myself or someone I know is bitten and constricted by a large snake?." Well first off, Don't panic!
Mass hysteria never helps anyone. Try to keep the person calm because the more they struggle the more the snake will squeeze as an instinct. Keep the person calm and talking and find some alcohol of some kind, Preferably a non-toxic booze of some kind, The stronger the better Vodka, Gin etc, If none is around rubbing alcohol will do but may harm the snake if consumed. Try to tip the snakes head downward so that it will not aspirate any of the alcohol in it's lungs and pour some in it's mouth, This will make the snake dislodge it's bite and most likely will back it's head up in disgust, It wont likely bite again so move in and start un-coiling the snake. Start at the tail and work your way around, In some cases after the alcohol dose, Snakes have been known to totally let go of their grip so you might get lucky. There is no reason to do harm to the snake, Cutting of it's head certainly isn't nessicary. 99.9% of accidents can be prevented. Most accidents take place during feeding. Snakes do not see well so if it smells like food and it's warm, It's food. Size isn't a concern, They will strike, Kill and attempt to eat just about any warm mammal. When feeding a large snake you should always have at least 3 strong people present, More if the snake is over 15 feet, NEVER EVER enter the enclosure with the snake with food or after handling food. Always use a seperate enclosure that can be washed thoroughly after a feeding so that it's not associated with food, Snakes get testy when food is coming. Use extra precaution any time a snake is shedding or during mating season as they are known to be aggressive, Even if your snake never has been before. Do not attept to feed/move/touch a female snake with eggs, They do not eat while they are incubating eggs, This is totally normal behaviour. Also use caution if your snake has just eaten in the past few days, Is cold, Has left over eye caps or any other obstruction to their view or is sick and always ALWAYS wash your hands before handling a snake, They have a very keen sense of smell.

It seems like a lot but the major rules are: Safety first, Be prepared and stay calm! with those in mind you should be ok :o)