Oh yeah, I totally get what you're saying, if you're taking your first steps into model editing all the geoset talk will surely sound alien to you.
In addition to that, as good as Magos' is, its interface is kind of clunky for doing the stuff I suggested (and many more),
Retera's Model Studio is a much easier tool to use for modifications like that, I wholeheartedly recommend it (though I still use Magos' for some things as RMS is incomplete atm).
When it comes to learning this stuff, Hive should have plenty of good tutorials on model editing. As for Retera's specifically, the author has made some video tutorials
on his youtube channel that you could find useful, I think.