Is there a trick? I know they're scored but I can never get a decent half broken off by hand. Its usually 1/3 and 2/3, and I have so far wound up using a full tab instead of bothering with whittling off a half in bits. May be a blessing in disguise because it seems to take a full tab to get commercial milk to set properly in a decent amount of time.
Next time I'm probably ordering liquid rennet.
A large knife (french chefs knife works great) and a sharp quick thwap. Keep your fingers clear!
Go to your local chemist/pharmacy/drug store and ask if they have pill cutters. I can get them in Australia - they are designed to cut pretty much any sized tablet into halves or quarters.
Cheers,
Alan