If you've only had him a few days I wouldn't bother him, other than to clean out any messes and give fresh water, for another 10-14 days. Give him time to acclimate to his new home.
On the hissing... I have several that hiss. They fuss but they don't bite, and once you have them out of their tubs they relax. OTOH my one incredibly defensive/nippy female doesn't hiss at all but her body language screams "I AM SO GONNA MESS YOU UP!!!". Classic S-shape neck, tale lashing, etc - she's 1000 grams and growing since she's also a chow hound. She never relaxes while being held, and will often strike out at any movement even while in hand. She's nailed me twice, neither time was a big deal. To move her we have to let her strike a roll of paper towels a few times, then once she gives up and turns her head away we can pick her up.
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