I left law, ended up in QA, and am now a full time software developer. I think being in QA helped a lot when it came to teaching myself - would be employers would be glad you had work experience in a professional software development environment. This will be to your advantage, though trying to go dev from a QA role at the same company may be more difficult for political/business reasons.

I think the thing that got me where I am now within a reasonably time period is picking a type of technology (in my case, it was learning iOS and Git well enough) I wanted to work with, then stick to that until you become employed while attending every hackathon and relevant meetup, time permitting. You'll need projects that demonstrate your aptitude and ability.

If you or anyone else is interested, my story is actually on Codecademy: https://www.codecademy.com/stories/155-from-lawyer-to-ios-de..., and I've even written a book about the transition: http://quitlawandcode.com/

You're going to do fine. I know it seems like such a binary and insurmountable transition, but the more hours and practice you have, the more OOP and other concepts will just click for you. Also, you're not too late! I started at learning at 30.

FYI: I'm terrible at math, though I love learning, and would like to re-visit it when I have some more time (probably when I have high school aged kids).