That's cute how she gets in your lap to put on the harness. Our cats just really don't like their's and struggle against them. Part of it is they're a little small for them now. So we just keep them indoors. We are protective mother hens and don't want anything bad to happen to them by being outdoors.
We don't let her out unless one of us will be outside, too. So we have a tie-down stake that we put near wherever we're doing yardwork. She chases butterflies, ants, and the occasional mouse while we pull weeds or whatever. We estimate she was about six months old when we got her, and we started right away getting her accustomed to the idea of the leash if she wanted to be outside. She likes going out - so she's accepted the terms. :-)