Treat possum joeys the same as a kangaroo joey.
If you find an injured adult handle with great care, possums can be very aggressive if threatened and have powerful and sharp claws and teeth. They will bite down and not let go and can crush a finger. Hold it by the scruff of its neck and tail, place in a sturdy box lined with a towel or put it in a hessian sack tied off and put the sack in a box.
Place the Quenda in a box with towels, jumper or screwed up newspaper for it to hide in. Bandicoots are ground animals and hide in leaf litter during the day. Like the possum they too have strong claws and sharp teeth. If forced to handle them hold them firmly behind the neck and body.