It is possible, but only if you have the necessary skills. But I don't recommend you completely abandon official work. No one knows what will happen with bitcoin in the future. You risk to remain without money and pensions. You will agree with me it is very risky.
I agree with you much better have a regular job and then work here in bitcoin I think you don't need much time to spent here, 3-4 hours I think just enough after your work. I think at this time you make double your income not only by your official job and also bitcoin too.