I need to structure the guide step by step. Start with the necessary tools: a PC, Google Drive access, Nintendo account, Hac-Shop app, and a USB drive or microSD card. Then explain how to download the NSP file from Google Drive to the PC. Next, how to transfer it to the Switch using Hac-Shop. Finally, install the game via the Homebrew Browser on the Switch. Also, include tips on legal sources for NSP files, like purchasing from Nintendo or using homebrew tools for backup purposes.