Some LFSs will hold fish for you, you just have to ask around.
I own FW
tanks, but I did help a friend move a 90 gallon tank with all fish from one location to another. You will need LOTS of tubs. First is...
1. Prepare some salt water for the tank about a week before. Make sure the Keep the water circulated using a powerhead. You need this in case you lose any water.
2. Capture the fish, coral, etc. and place them in their own plastic bag with the tank water. If it's too cold or too hot in your area, I would place each plastic bag with the fish, in a cooler. Wrap each of them up in a newspaper so that the bags do not turn over easy. Close the cooler. The dark will ease their stress abit.
3. You can wrap your LR
with wet newspaper and place them in tubs.
4. Put all your LS
in a tub with some tank water. Make sure the tank water is a few inches from the sand surface. Make sure this is secure so no water will spill.
5. If you have a wet/dry filter, put all your bioballs and media in some tank water as well to retain the bacteria. Place them in a tub as well. Make sure it's sealed.
6. Get all inverts and place them in a tub of tank water. I would not suggest a bag, since they may damage it and cause the bag to leak.
7. I would suggest saving as much water as possible.
8. Take everything apart and move everything to the new location and set it up.
9. When everything is setup, put some saved tank water in the tank and then the sand. Wait for the sand to settle, then add a little more filling the tank about half way.
10. Add the LR
11. Now add more water until the tank is filled.
12. Wait about an hour or for the temp to set properly and any other debris to settle.
13. Float the bags as if you were acclimating the fish for the first time.
12. Then release the fish.
Make sure you plan the whole day for this. The earlier the better.
I'm not sure if I suggest housing the fish in another place, becuase you will stress the fish catching them and transporting them to the new location. They will then get stressed being released in a new environment. Then you will subject to stressing them again by capturing to bring the back to their new location. Etc. Fish can remain in their bags for about 20 hours (they do this when you order fish online). It's not going to take you 12 hours, I hope. If so, I would provide airstones in each bag and change about a cup of water from the bags, using the saved tank water.