Neutering will reduce or eliminate altogether the very disagreeable habit of spraying wherever I go. The cost of spaying and neutering is usually less than the cost of raising a litter of kittens. There are millions of pets at animal shelters right now waiting for homes. This massive overabundance of us is due to nothing more than human irresponsibility. I am glad that you wish to be responsible.
Cats suffer no ill psychological effects as a result of neutering.
When performed early, you merely eliminate any unwanted behavioral habits. In the hands of a good veterinarian, the procedure is relatively simple. The benefit to me is a healthier life. The benefit to you is a happier, more affectionate kitten. There are a variety of signs and some are often very subtle.