I use small taps in a pin vice but not gripped to tightly, so that if it binds the vice will revolve slightly, you get used to the feel as soon as it starts to bind so you can stop before it shears. With small taps 1/4 turn and back off, but also make sure the you have used the right tapping size drill !
Lubricant of coarse, I use Trefolex cutting compound.
Col.