> On the other hand, I watched a colleague leave a stable job to start a project from scratch. He had a good reserve, but he burned through it and the project d

> On the other hand, I watched a colleague leave a stable job to start a project from scratch. He had a good reserve, but he burned through it and the project didn’t make any money. Last I heard, he got a new job. This, for me, leads directly to the correct answer to OP's question. Worst case scenario, you get another job. Of course you quit and give it a go. What have you got to lose? Your savings & potential earnings are likely not that much, and you don't have to burn through all of it anyway. Do it.