You should be fine to move your rock around, but it's better not to have your hands in the tank too much. Obviously, moving stuff around will annoy your corals a bit if you have any. If not, it's a good idea to get it looking how you want before you add them. I would keep an eye on your water params for a few days afterward, but you should be ok. Hope you find this helpful.
Jase
Can someone tell me how to get some from the sea.( what to look for). have some diving buddies that can get it. Also , how can it be transported 600kms by road? must it be fully submerged in water