> I'd planned to hand in my notice tomorrow. I've been fortunate and careful, and can afford to live off of savings for 2 or 3 months and still have left overs.

Hmmm, Isn't 2-3 months worth of saving too low? For comparison, freelancers I know would feel nervous if they don't have cash that can cover living expense for at least 6 months.

I think you should take long vacation and think it over before quitting.

Or, try to secure some freelancing contracts on your area of interests before quitting your old job.