WP,
I achieved my CPL/IR (and instuctor rating plus various add ons) by keeping my Monday to Friday job. It was the only way that I could finance it all. I had a mortgage to keep up and house and car to run as well. I had to keep working (and still do) to pay for it all. I think it's a brave man (or woman) who gives it all up and goes for broke. Brilliant if it all pays off, but you'll be up whatsit street if it doesn't.
Best of luck. Regards, GT.