As another commenter mentioned, it’s rather silly to use a USB stick to transfer files from one HDD partition to another. However, there’s absolutely no need to use a Live USB session, and their description of how to access files on block devices was … wrong.
There are programs you can find for Windows to access Linux filesystems, but those tend to be flaky; NTFS support for Linux is mature enough to accomplish what you need. You should be able to install NTFS support with apt and access the Windows partition like any other drive - I’ve done this. Googling “Linux Mint NTFS” should find you what you need.
The film Hey, Stop Stabbing Me! is reminiscent of early Parker & Stone or Troma, and the title basically says it all. In spite of its non-existent budget and inexperienced cast, I recall it being competently paced and downright hilarious (on purpose!), including multiple memorable quotes such as “don’t be making fun of my hoe-saw,” “dude, she’s twelve,” “comparative literature,” and naturally, the titular “hey, stop stabbing me!”