Yes that was said as sarcasm however soldering is alot simpler than one might think, the tool acts like a ink pen, you just have to know when to pull it up (for example if you were drawing a dot with an ink pen the dot gets larger until you remove the pen)
anyway, i would rate the danger level as "flashing your Z" the dangorus factor depends on how much of a linux guru you are as both types are undoable (yes even soldering can be undone, however you might lose the Z's ability to power an external device if you do somthing like not pay attention to the tutroial or use a plumbers soldering iorn instead of an electricians)
that said, find someone who knows how to solder and ask them, if you live in sydney i may be able to help you out
