I have a ton of peonies in my garden.

They are lovely, but I would like to move them around.

I've tried this before, and they didn't make it. Apparently, they are very
finicky to being moved.

I'm in western ny, zone 5 or 6 and they are all loaded with buds, about to
bloom soon.

When is the right time to transplant and/or split without killing them off?

Sally