To try to solve the problem of your kitten hissing at you or at every other person who comes near him, you should first understand the reason behind this.
Hissing is an act of defense for the kitten.
He may be afraid of a person or another animal so the kitten hisses to try to scare them away.
As a kitten, he may feel vulnerable at all times and thus hisses when somebody approaches.
He may as well still be adjusting to the new environment.
In some cases, this kind of aggressive behavior in a kitten can be caused by a physical condition.
Find out if your kitten is suffering from pain or any illness.
Have him examined by the veterinarian.
If the kitten is not suffering from any medical condition, it is then up to you to solve the hissing problem.
At first, the kitten may be unsure of your approach.
Reassure him by approaching him with care and giving him treats.
When visitors come to your house and your kitten hisses at them, just ignore him until he has calmed down.
Have your guests give your kitten some treats or a gentle pat.
Slowly try to gain your kitten's trust.
Provide him with a healthy and safe environment.
Eventually, he will feel confident in your presence and trust you around him.
Slowly introduce your kitten to more and more people so that he wouldn't get scared when there is a crowd in your house, especially if you would want to hold a party at your place.
Spend time with your kitten and play with him using toys.
Never let him think your hands are toys or he will bite or scratch them.
The best way to let your kitten know you is to spend quality time with him.