I'd like to fix this old radio but I don't know how to go about (doing) it.我想要修理这台旧收音机，但不知从何着手。

Despite the threat of war, most people are just quietly going about their business. [=most people are just doing the things that they usually do]尽管受到战争威胁，大多数人仍像往常一样平静地生活。