LOL
1. No, just unbolt the wheels and switch them... as long as your car has the original tires, I hope to God they got the right wheels mated to the right tires at the factory.
2. No
3.KM or miles? If KM, you should get about 50K-60K or more as long as you arent doing a bunch of burnouts.
4.You would need 2 new REAR wheels, people do it all the time but DO NOT squeeze a 275 on a front wheel.
5.
Friday afternoon or monday morning car?
Are you sure no one ever rotated the tires? this would cause this.