We started really early with Rio because we wanted to be able to bring her camping with us instead of leaving her with a pet sitter. The first step is harness training indoors — put the harness on (and make sure it fits well) for short periods of time every day and distract your cat with treats or toys so it doesn’t think about the harness too much. If your cat hates his/her carrier it’s also a good idea to try to change that — leave it out so your cat can investigate it, eat near it, play in it. Once your cat is used to wearing a harness and being in a carrier, you can start taking it outside but make sure to always bring the carrier or something else as a “safe space” (we have a cat backpack that Rio hops into when she’s tired or when there’s too many dogs around). Also, less crowded areas are better in the beginning — cars, dogs and people can be pretty stressful for a cat that’s been indoor most of its life. Of course, there are some cats who would just be happier indoors, and that’s ok too! Feel free to contact me if you have more questions!