We were in a fwd saab and only put them on the front. We definitely should have paid the guy the extra $20 to put them on. It's not too hard, you just lay them on ground and drive over a bit and then fold them up and around and clip them. You can get them anywhere along the route (ie: gas stations etc). I don't think you need all 4. I wouldn't worry too much until you are there...maybe it will be dry. If not, chains will turn those racing slicks into awesome snow tires! Have a blast.

joe