I did a similar transition. I started doing projects on the side, many of which never worked out. Finally when I got something that got traction I left my job.

I did a similar transition. I started doing projects on the side, many of which never worked out. Finally when I got something that got traction I left my job. Your first idea could be the one but most likely it is not. Experimenting first while on the job will reduce your risk considerably.