I use aviation style tin snips, the kind with the compound
action. Use the straight cut.
JazzMan
I once, very long ago, in a galaxy far away, made a 6-up of a 2.5"dia.
round circuit, double-sided, on .031 fiberglass. (copper clad, both sides,
I etched it in FeCl3, drilled it with a little Dremel drill press, and
fudged on the vias).
I don't remember exactly what tool I used to trim them to size, but just
that fact that I don't remember indicates to me that it must have been
trivially easy. Like, Mom's sewing shears or something.
But this was .031" stock - I guess for .062, if I was really persnickety,
I'd press a die grinder into service as a little router.
Getting them apart in the first place, well, I'd say, shear them, score
and snap them, saw cut them, whatever works. It's pretty much a matter of
taste and getting your hands dirty. ;-)
Cheers!
Rich