just loader up the mod via technicLauncher... a bit of a process but smooth enough with the aid of the doc:
littleBits Minecraft Mod | Install Mac
the java update on mac is a little easier than described if you goto system prefs and click java, you can auto update from there.
the doc needs a final step about then relaunching everything and opening up the single player world
i don't yet have my littlebit-duino in hand, bu tas soon as i saw the in game button to tricker my LB recvr, i got chills of excitement