Here's a little cat in the carrier trick. It's more like desensitization. I leave our cat carriers out, not shut away in a closet. I have one tucked into a corner of the living room with a blanket in it and another is under an end table with a blanket in it too. It's a little kitty hidey hole. My cats can frequently be found napping in a dark cave of a carrier. Also, because I have special needs cats, I weigh them once a month using the carrier on the scale. They get lots of yummy treats for going in their carrier to get weighed. So they associate the carrier with lots of great things. Whenever I pull the carriers out to get weighed or for the vet visit, they come running!