What sam said about leaving the carrier in the room is a fab idea and it works !
i leave two of my cat carriers in the bedroom all the time with blankets in and they often sleep in them as beds
i dont have any probelsm getting them in there carriers when we go to the vets but i do have a problem getting them out once we r in the vets room lol
all my cats get nervous about going to the vets but its not a huge problem they dont get overly stressed or anything ,
bridie often poohs n pees in her carrier where she gets nervous