Heck yeah, linuxpackages rocks. It's one of the reasons why Slack is my distro of choice -- pretty much if there's any package I need, I can get it from there.
One comment about Audacity - you will need to also install wtGtk-2.4.2 (first) before you install Audacity (second). Once it's up and running though, it's very easy to use. I'd *strongly* suggest spending the 20 minutes or so doing the tutorial, as it will address many of the most common questions/tasks. As for breaking your large wav file into pieces, you basically will just want to click on Project then Import Audio then select your file. You can cut/paste/save the individual pieces as separate files. Good luck with it -- J.W.