Well, since you've figured out how to install programs like empacman and emptris, launcher installs in exactly the same way. If those are the enly two programs you want/have installed on your empeg, then you don't really need launcher. At least, not until both of those support launcher, which means not binding to the hijack menu and running as daemons.
If you want to install launcher anyway, it installs just like the others. Once you know how to do that, then everything you need should be in the README file. If you have any questions whose answers aren't in there, or want clarification on something in there, ask away...