This might be slightly offtopic but
I've been thinking of working on my own ideas for a decade now. I tried working on projects in the evening and weekends but there isnt enough time. Not only does it effect your social life but also effects your motivation and drive in general. After looking at code on a screen for 7 hours, last thing you want to do is go home and look at more code [I guess this depends on your age, i'm 32 now - not an night owl no more]
Anyway i started contracting last year for this exact reason, at around £300-400 day rate and now i've saved enough to quit and follow my 'dream', my last day is JULY 7th. I have enough savings to last me 2 years, sustaining my current social life. no frugalness.