If I was sensible, and with a following wind, I would do the following:
Bank about six months worth of living expenses (this amounts to about six grand) – is this doable? possibly, if I’m doing comics while working – and money from comics gets banked.
Line up 12 months of comic work — about 12 pages per month. Is this doable? possibly by mixing 2000ad/megazine and some other work (but what???)
Take a sabbatical from work for 12 months while I draw.
From there, aim, by the age of 40 (argh!) to be a full time pro comic artist.