Most cars (from my experience) in Germany have separate tyres for winter, so changing them is something you need to do twice a year. Back in New Zealand I drove for about 12 years and never had to change a tyre.
No need to change a tire in Germany (or elsewhere) either. There are plenty of shops that will happily do it for you. It's an easy thing to plan for.
Besides, the northern US has more extreme winter weather than Germany, so based on this, Americans should be better at changing their tires than Germans.
Besides, the northern US has more extreme winter weather than Germany, so based on this, Americans should be better at changing their tires than Germans.