Just bought an Blizzard 1260

[zipper]

Should I copy the 060/040 libraries to LIBS: drawer before plugging the 1260 in? Is that all I need to do in order to make the Bliz 1260 to work?

With OS 3.9 it's very easy - you just need 060 library and Setpatch loads it; with lower versions you need the stub 040 library that recognizes the CPU/card and then loads the right library (040/060/040old).

[zipper]

The dummy (smallest) 68040.library will determine what system you have and load the correct library. This way you don't need to do any modifications to your system, regardless of if you have stock A1200, blizzard 1230, 1240 or 1260.

or some other 040 card - more probable with an A4000.