Hello trace, I am by no means an expert but I am going through a similar situation with my resident cat (Amber - 2 year old spayed female) and my new 6 week old kitten (Millie). I got Millie on Saturday and as of yet, I have not let her and Amber meet. I have been keeping her in my spare room with everything she needs, litter tray, food etc and allowing Amber run of the rest of the house. Amber is aware of Millie's presence and is being very off with me, she seems to be sulking, and she hisses if she ever happens to go near Millie's door. I am attempting to swap their scents by stroking one, then the other, by swapping blankets and toys as recommended on here (thank you siamesekelly and janee). If Amber happens to go outside, I allow Millie to walk round the rest of the house to spread her scent that way too. I have let Amber in Millie's room and shut Millie in mine while Amber investigates. I did a lot of reading up on the subject and am really worried about their first introductions but I think with time and patience it will be ok. I am sure you will be ok too and in time your two cats will be best of friends. Good luck!