It will be a local move so that will make it easier. The sales contract will include some statement about the irises and lilies not conveying with the property and the seller should expect to be on the property digging until the task is finished. I have saved super market fruit trays to move them, so hopefully I can move around 25 at a time. If lucky some will bloom early and others will keep their buds when moved with their own dirt clump.
It will be an interesting challenge.