Here's how this works. Keep your day job. Spend your extra hours making furniture - 25% coming up wiht something interesting, 25% marketing, 50% making.
See if you can manage to get a reasonable hourly rate for your stuff. If you're making it in small volumes and you can't, increasing volume isn't going to help.
if you can do it in small volumes, see if you can do it in greater volumes and chart outcomes (What sells, to who, how easily, how profitable).
If you can't get to the point where you're making 1 1/2 times what you think you'll need to make to make ends meet comfortably, it won't work. If you can't get there, then you need a different plan.
For example, there are plenty of engineering managers, etc, in the US who have left work for a few years and tried to make things, repair things, design things that they find more interesting (one comes to mind repairing guitars and making and manufacturing guitar boutique pedals on a small scale). After a couple of years of that (he had a working spouse) the last I checked, he's a software engineering manager on linked in.
BE realistic, be honest with yourself, measure things, try things that you think people will buy and be ready to make something different than what you expected.
40 years ago, my mother embarked upon this - she's a retired teacher. She never stopped teaching, but I'm sure if she could've come close to even-up wages, she would have. She ended up selling over a million dollars worth of stuff during that period (or double that in current money) and spent about 20 hours a week making (as much as we hear teachers here talking about workload, I watched this for years - teachers have lots of free time if they run their classroom efficiently and don't waste their prep periods in the teacher's lounge or take on things seeking glory). What my mother was able to make was about $30 an hour in current dollars. She saturated the market and took a few months off from it each year after Christmas - not completely off, but far less working.
So what's the point of this? First, she ended up making what people wanted her to make. She started out drawing, and then designing and felt above the stuff she was making shortly after that - it was clear (she was just making hand painted folk art stuff that is early american style) that she could both make and retail her stuff easily if she was willing to do early american simplistic stuff and that was the end of that.
Perhaps it was luck, but she ended up maintaining the market size almost to a T for the entire period, but always had some stuff left over, just not too much (nobody was knocking down her door to make it something she could do full time). What she did was a far easier sale than furniture, too.