I read your earlier post - I
love that Pam Johnson-Bennett book, it's falling apart, I've read it so much. It's been read, reread, I've highlighted areas, there are post-it notes on almost every chapter - and when I was a newish adopter, I followed her method to the letter. Yes, it was very time-consuming, but it worked.
I changed the way I introduce everyone for two reasons - the Special Needs cats were coming to me thick and fast, and I didn't have enough room to do the separation and gradual introductions. Secondly, at the rescue centre, they think if cats are hissing and growling when they are first introduced, it's fine and to be expected, it's only the punch-ups and fighting they are worried about. They gave me a large kitten pen and suggested the new arrival lives in there until the hissies are over. It works! Some introductions have been easier than others... Colin, when he was a kitten, he just walked around, did a meet and greet, selected a cushion and then slept through until dinner. Tommy strolled calmly out of his carrier, purring his head off and it was like he wasn't a new kittie at all, but rather somebody who had been with us forever. Figaro, on the other hand, maybe because he was older, it was quite stressful.... Still, he has only been with me for three and a bit weeks and look at him, he is transformed. A total lap-cat - and he has a best friend already. I just took this photo of them
View attachment 1617107
So - I don't think there is a wrong/right way to do introductions but if you can get hold of a copy of that book,
OP, I think you'll find it really helpful.