Brakes will work to hold / stop it in this kind of scenario. They'll just need more force on the pedal than normal. Ditto steering - it will be very heavy, but you can heave some lock on before pushing.
If its going up a slope then I would say at least four mates to push, and one to throw a brick under a wheel if they run out of steam! The other option is a ratchet strap tied to something solid to winch it up the driveway.
Get the tinnies in
