I also would like to know how to save seed.

We harvest seed pods when they turn straw color and are just starting to dry out. The key is in how ripe the seeds are: carefully open the pod while it is still on the plant and examine the seeds. If they are black, they are ripe. If they are dark brown they may be ripe. If they are green, they are definitely not ripe.
We shuck the seeds within a day of harvest as we have noticed that many pods will rot if you try to dry them out in the house. There may be a slight loss of germination percentage but rotten seeds never sprout.