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Just make sure to follow the guide closely and carefully. To download a few of the files in the guide, you'll need to have some sort of torrent client on your computer like qBittorrent.
Other than that, it should be fairly easy, just make sure you read and comprehend, and especially make sure you don't skip anything.
The starter kit for the HBL should come with ftpd, a FTP server for the 3DS. If you use that, you should be able to access the contents of the SD card via Finder, by connecting to the server over your LAN. (I'm a bit rusty with my OS X skills, so I'm not certain. I switched to GNU/Linux a while ago.)
EDIT: Ah, it seems Finder restricts mounted FTP servers to read-only, which won't help your situation if you want to copy files to the SD card. In that case, you'd have to use a separate FTP client. I recommend Cyberduck.