Karin, I took about 50 daylilies to my Dad last October. I had potted them up first, and then realized I had no room for all the pots. So, I took them out of the pots, shook off most of the dirt, and put them in plastic grocery bags. I then put a bunch of the plastic grocery bags into large garbage bags, making it easier to move a lot of them at once. They sat like that for a few days. I then gave them to my Dad, who is out of state. It took him at least two weeks to get them planted, and they are blooming like crazy this year! He didn't lose even one of them, and he's in a much colder zone than we are. I can't speak for the rest of the plants, but the daylilies did fine for me that way.
If you are moving Coral Bells, maybe you can just take starts off of them instead of digging out the whole plant. If they aren't tiny, break off some of the outside shoots. I accidentally tripped over a huge Coral Bells here a couple of weeks ago, and broke off about 8 big chunks. I put the chunks in potting soil, and within a few days, they were growing new leaves. I didn't realize how tough they are!
I think on the rest, you have to decide how much you spent, and if they are worth moving. I've heard that Peonies are picky, and I only have one that has survived, so maybe that's true? I know that they will live forever though, and many people have a sentimental reason for having them. Maybe you can take a start off of that too, but I'm not sure. As for the hosta, those can be expensive to buy, so it's worth trying! I was told recently that it's okay to move ferns this time of year, so I'd give it a try. I'm going to move some over at my Mom's house next week, even though it's really hot. Supposedly, they do well. I have no personal knowledge of that though!
Last but not least, good luck!
