It's brilliantly simple. A feature I thought I'd hate, it's genius.
Get in car. Put seatbelt on. Foot on clutch, first gear, go to move away and the handbrake/hold disengages seamlessly. You barely feel the sensation of it disengaging.
Stop at traffic lights and put your foot on brake. Now you can actually take your foot off the foot brake pedal and you'll notice that the handbrake on warning light comes on but it's green rather than red. This is the auto hold. Even the rear brake lights remain lit while this is engaged.
Now put car in first gear,go to move off and hold disengages. Smooth as you like.
Park car, unbuckle seatbelt and the handbrake engages.
Basically you set it once when you collect the car and you never need to touch it again.