You can drive barefoot if you wish, although it probably would not be a recommended practice.
You go to an actual truck driving school.
Yes, but you can't drive it.
No, every semi truck does not have a plug in heater.
You go to a truck driving school and learn how to drive a truck.
Someone who has been trained and licensed to do so.
Truck driving school and some follow-on training.
You need to be 16 years old to drive a semi truck all over the United States of America.
About an hour at highway speeds.
To drive a semi truck, you need a specific driving license that allows you to drive that class of vehicle. As well, as proper education and training such as driver's ed.
It is not illegal for a semi truck driver to honk their horn as long as it is used in appropriate situations, such as to warn other drivers of potential dangers or to communicate with others on the road. However, excessive or unnecessary honking can be subject to local noise ordinances.
They have large blind spots to the rear and on the sides.