I was also having this exact conversation over the weekend, so here are my thoughts: Don't quit your stable job just yet, even if you don't like it. If you start a business you're likely to go through a period of financial insecurity...so enjoy it whilst it lasts. It has never been a better time to start a business. I'm a big fan of the
recent marketing campaign by a well known website builder, using the phrase A website makes it a business. The great thing is that websites don't have to be expensive. Pre-built templates are cheap, whilst drag and drop editors have grown in complexity considerably over the past few years.
This means that you can perform substantive testing of your business before taking the plunge. You are able to set up a website and social media presence, gain feedback and iterate with very little start up costs. It makes no sense to invest your savings in an unproven model. Guess what? If the testing period is successful, it makes that final decision of starting the business and potentially resigning from your job that much easier.