I have just 2 words for you

DO IT !!!!

Introducing a kitten to an older cat is always easier than an adult cat to an adult cat. But the later can be done also. I would not want anyone to have just one of any species. Animals need to be around others of their own kind to be the happiest.
After over 16 introductions, I can honestly say there was never blood shed (LOL) nor any real problems between new and old cats. Some relationships just took a little longer than others.

So I'll be waiting for pictures of your new cat.