I'm not going to say 'don't do it', because it's exactly what I did.
In fact, I was earning a lot more than you (this was back in 2007) and I got fed up with the industry I was in. I had wanted to be a trader for a long time and had the very misguided opinion 'it can't be that difficult'... so at 27 years old, I chucked the job in. I didn't really have a plan, just a LOT of savings behind me which I thought would see me through.
To cut a long story short, I ended up going back to my old job, minus thousands in savings. I didn't
actually burn through that much in trading losses, but more living costs, mortgage ..If I consider lost opportunity, the whole experience cost me an eye-watering amount.
All has worked out well for me though and I learnt a hell of a lot from the experience. But please, think very carefully before throwing away a 40k+ job.
You can learn to trade in your free time. Why not do that and see how you go?
Just my 2p...