never ganna learn if you don't try it.
I'm rebuilding the 1g, and its an expensive jdm engine, with excessively expensive parts...and its my first one.
just pay attention to what your doing, and talk to your head shop as you go, (you'll need a headshop for the skim, so they should help you out to a certain extent in giving you pointers)
be brave, not rash and you'll get it done.
but you have to consider how much money a poopie 4k is worth
i sold my good engine for under 200 bucks i think it was, theyre worth SFA :(