I let the pods mature until they start to crack open on their own. Then I take the pod off and open it up and harvest the seeds. I let the seeds dry a few days before putting them in an envelope with the pod parent (the name of the plant I took the pod from) and pollen parent (if I know that) marked on the envelope. The envelope is then put in a plastic bag and stored in the fridge until I am ready to geminate the seeds indoors, usually early February.
I hope this helps!