I would think the iris are the easiest. You are basically kissing this years bloom goodby. Trim back the foliage and wash the dirt off the roots and pack them in a cool DRY place. You will notice when you buy them that they are usually shipped in coir. This makes a good packing medium for them in that it breathes well. The daylily forum could probably give you some specific recommendations for them as they prefer damper roots in shipping. (The problem is avoiding mold) The Siberian iris I would trim the foliage back, give the plant a good soaking, dig as much of the plant as I wanted to take and pack it dirt and all in a box with sawdust in it. The Shasta daisy should be easy to replace down there and cheaper to replace than move. Hopefully the weather will be cool while you're moving.