oh well too late to help you.
I bought an expensive hammer and punch set recently but
for all intents and purposes use the center nail punches
from Stanley that I got at home depot (for the roll pins),
use a thin blade to put in front swivel detent , a screwdriver for
the grip screw, and a punch (not sure what size) to put thru the
hammer and trigger to hold them lined up for their pin insertion
(I have done it without the punch, but its much easier this way)
plus a small hammer (although I have used whatever is handy).
Oh and instead of using tape to mask off the parts of the receiver
for scratches, I use a couple of post it notes.
Essayons