in anticipation of it arriving
Check out this thread
The first post is a PM3 emulator that @Aoxhwjfoavdlhsvfpzha built and shared with us, it will help you get familiar with the command line interface
The next few posts are the abridged version of how to setup and install the PM3 quickly and easily
The longer and very thorough version is here, which will give you a better understanding of not just what to do, but why you are doing it.