I have to move a peony. When should I do this and are there any special considerations. I understand they DON'T like to be moved. Also, is there any location it would prefer in our Okanagan climate?

You can move the peony at any time preferably not when it is blooming in the spring. You were quite correct they do not like being moved and will not bloom for a least a year after moving. The other important consideration is that they don't like to be planted too deep, try and plant at the same depth that you take it out. Since they bloom in spring you can place them in mostly any location but remembering that here in the Okanagan the sun from 1-3 gets really hot and maybe a part sun, part shade location would be best.