Before you go to the animal shelter to adopt your new cat it is best to get your home and the cats safe room ready. The safe room is where you will keep the cat while they get acclimated to your new home. It is not wise to release a new cat into your home and expect every animal to welcome them. It takes time and it is less stressful on everyone if you socialize the new cat with home and other pets.
Whenever I bring a new cat into the home I will set up a safe room and treat the room with a Feliway diffuser. I plug the diffuser into electrical outlet and it emits a scent that is soothing to the cat. It is a good way to keep the cat happy and comfortable in new home.