Is this a swap that you would do in person? If it's one of those, "We'll both ship at the same time" deals.....I'd be very cautious.
Every once in a blue moon, someone gets lucky and scores a very sweet deal....but more often than not, the "If it's too good to be true..." rule comes into play. If you can see the snake in person and walk away with it...then you have a chance to get around that rule....but if you have to ship your snake out and TRUST that the other guy does the same.....you might just find yourself kicked in the teeth with that rule.