Hi there ! I'm glad to see that you're getting a new friend
And a Dunner stunner to boot. ! Unboxing is pretty straight forward....when you open the box you can let him get used to the light for just a minute or so before taking him out. Remember he's been in pitch darkness for 15 -16 hours so just a brief moment before hauling him out will let his eyes adjust. Then just put him in his tank. I wouldn't
bathe him....unless it was very hot in the box he will not be
thirsty and that can stress him a bit. If he does feel hot for some reason you can put him in a lukewarm/cool
bath for about 10 minutes....but it's not likely. You can offer a bit of water on his snout after an hour or so....he may or may not be interested. Offer food after an hour or so [ or really as soon as you like] but not a huge meal , wait until tomorrow for that. Hopefully he'll settle in easily for you.