Personally, I would give him time to get used to the surroundings and your presence before giving him something else to freak out about; i.e. handling. Corns are great snakes and get used to owners rather fast...but not right away. Give him some time, and maybe sit quietly in front of the tank for a while from time to time to let him know you won't grab or hurt him if he comes out, and I think he'll come around.

I know what it's like holding a big guy. My Ghost is 4'4" right now and a total handful, even tho he's a complete sweetheart. Good luck!