I've taught multiple friends, daughters, and an ex-wife, on both motorcycles and cars. Couple stalls shouldn't hurt.
Things I've learned...
Practice "clutch and brake" before you start, with the car NOT running. Just to get the muscle memory for finding those pedals (or levers, on a bike) quickly. Makes the learner comfortable in how to abort safely at any time.
Start in an empty parking lot with a very slight downhill slope, makes the first lessons a little easier.
On a car with any kind of decent power, show how you can start just by releasing the clutch slowly, no gas involved. Make them do it. This will really help get the feel for the clutch more quickly, really helped when teaching one of my daughters. Super easy on a car with a lot of power like, say, a BW.
The previous paragraph is complicated by the auto blip / anti stall feature that some cars have. In which the car will give itself more gas if it thinks it's going to stall. One example that I'm familiar with:
Hey everyone! We asked our buddy Scott who has been driving around a manual Badlands for 7 months help break down some of his top tips, tricks and secrets of the manual transmission on the Bronco! H
thebronconation.com
See 1:40 of this video:
Unexpected side benefit on a new car with ASS (auto stop start): If you stall the car when you lift off the clutch pedal, it will start right back up when you you press the clutch back in. Not the case with our BWs, which don't have ASS, but surprisingly helpful for a new driver who needs to get the car restarted quickly after they stall it when driving on the road.
See 4:35 of the same video above: