What to do with pups of bromeliads

I've got a few bromeliads... the flowering is over and done.

They are growing pups. How do I transplant the pups into their own pots?

How big should they be before i do it?

Any links to comprehensive web guides?

To be safe I usually make sure the base of the pup is covered in compost, then wait and from time to time dig around the base to check for roots, then it is ok. If you detach them bfore roots you neet to root them - which also works but the first is safer.

BR
Chris