Your best choice would be to go to your local garage to get them changed. They will have experts and professional equipment who can replace them quickly and safely.
Yes, they can
Yes, they can
It depends on the use, but yes, they have to be replaced periodically.
skeletal muscle
Yes. Not only can, but should be.
Yes, if you also change wheels.
Yes. can i install traditional tires on run-flat rims?
Bald tires can effect anything concerning braking. You will not stop as quickly with bald tires as with tires with tread period. No matter if you have ABS or not.
Yes they do.
Tires have molded indicators called "wear bars." If these are visible across the tread pattern, your tires need to be replaced.
no
Depending on what kind of race, the tires get worn quickly during the race.