A tip? We were told three fingers for a ewe, two for a ram.
Hold your hand under the tail as if patting its bum! (Sitting at the kitchen table trying to put into words what my imaginary lamb bum patting hand is doing
)
The tail hangs down the back of your hand, thumb pointing up (this sounds so wrong
).
The tail hangs down over the back of your fingers, band gets placed two fingers down for a ram lamb, three fingers down for a ewe lamb. I typically thing this is a little short and give it a bit more, to then look in the field a little later and regret leaving too much tail!